Phenylpyridines

2-Pyridin-3-ylbenzaldehyde, ≥97%, Maybridge

CAS: 176690-44-1 Molecular Formula: C12H9NO Molecular Weight (g/mol): 183.21 MDL Number: MFCD02684097 InChI Key: DTUANRRVVJRTJS-UHFFFAOYSA-N Synonym: 2-pyridin-3-yl benzaldehyde, 2-pyridin-3-yl-benzaldehyde, 2-3-pyridinyl benzaldehyde, 2-3-pyridyl benzaldehyde, benzaldehyde,2-3-pyridinyl, 2-3-pyrldinyl benzaldehyde, benzaldehyde, 2-3-pyridinyl, pubchem22510, dtuanrrvvjrtjs-uhfffaoysa PubChem CID: 3857593 IUPAC Name: 2-pyridin-3-ylbenzaldehyde SMILES: C1=CC=C(C(=C1)C=O)C2=CN=CC=C2

Alfa Aesar™ 2-Phenylpyridine, 98%

CAS: 1008-89-5 Molecular Formula: C11H9N Molecular Weight (g/mol): 155.2 MDL Number: MFCD00006280 InChI Key: VQGHOUODWALEFC-UHFFFAOYSA-N Synonym: pyridine, 2-phenyl, o-phenylpyridine, pyridine, phenyl, 2-phenyl-pyridine, phenyl pyridine, 2-azabiphenyl, 2-phenyl pyridine, 2-phenylpyridine, pubchem13085, 2-phenylpyridine???? PubChem CID: 13887 IUPAC Name: 2-phenylpyridine SMILES: C1=CC=C(C=C1)C2=CC=CC=N2

3-Pyrid-2-ylbenzaldehyde, ≥97%, Maybridge

CAS: 85553-53-3 Molecular Formula: C12H9NO Molecular Weight (g/mol): 183.21 MDL Number: MFCD02684103 InChI Key: SAPNGHSAYQXRPG-UHFFFAOYSA-N Synonym: 3-2-pyridyl benzaldehyde, 3-pyridin-2-yl benzaldehyde, 3-2-pyridinyl benzaldehyde, 3-pyridin-2-yl-benzaldehyde, 3-pyrid-2-ylbenzaldehyde, benzaldehyde, 3-2-pyridinyl, 2-3-formylphenyl pyridine, acmc-209q6q, benzaldehyde,3-2-pyridinyl, 5-2-pyridyl benzaldehyde PubChem CID: 3710039 IUPAC Name: 3-pyridin-2-ylbenzaldehyde SMILES: C1=CC=NC(=C1)C2=CC(=CC=C2)C=O

Alfa Aesar™ 3-(3-Pyridyl)benzeneboronic acid, 98%

CAS: 351422-72-5 Molecular Formula: C11H10BNO2 Molecular Weight (g/mol): 199.016 MDL Number: MFCD16658918 InChI Key: SSVQXHWHJJERAP-UHFFFAOYSA-N Synonym: 3-pyridin-3-yl phenyl boronic acid, 3-3-pyridyl benzeneboronic acid, 3-pyridin-3-yl phenylboronic acid, 3-3-pyridinyl phenylboronic acid, 3-3-pyridinyl phenyl boronic acid, boronic acid, 3-3-pyridinyl phenyl, 3-3-pyridyl phenylboronic acid, 3-pyridin-3-yl phenyl boronic acid pinacol ester PubChem CID: 58526507 IUPAC Name: (3-pyridin-3-ylphenyl)boronic acid SMILES: B(C1=CC(=CC=C1)C2=CN=CC=C2)(O)O

Pentafluorophenyl 6-phenylnicotinate, 97%, Maybridge

CAS: 934570-41-9 Molecular Formula: C18H8F5NO2 Molecular Weight (g/mol): 365.259 MDL Number: MFCD09702345 InChI Key: YUPUNKGUYBKZST-UHFFFAOYSA-N Synonym: pentafluorophenyl 6-phenylnicotinate, pentafluorophenyl 2-phenylpyridine-5-carboxylate, pentafluorophenyl 6-phenylpyridine-3-carboxylate, 2,3,4,5,6-pentakis fluoranyl phenyl 6-phenylpyridine-3-carboxylate, 6-phenyl-3-pyridinecarboxylic acid 2,3,4,5,6-pentafluorophenyl ester PubChem CID: 24229464 IUPAC Name: (2,3,4,5,6-pentafluorophenyl) 6-phenylpyridine-3-carboxylate SMILES: C1=CC=C(C=C1)C2=NC=C(C=C2)C(=O)OC3=C(C(=C(C(=C3F)F)F)F)F

Alfa Aesar™ 6-(4-Fluorophenyl)pyridine-3-boronic acid, 95%

CAS: 1072944-20-7 Molecular Formula: C11H9BFNO2 Molecular Weight (g/mol): 217.006 MDL Number: MFCD09037487 InChI Key: COZZGWRIBKHUFL-UHFFFAOYSA-N Synonym: 6-4-fluorophenyl pyridine-3-boronic acid, 6-4-fluorophenyl pyridin-3-yl boronic acid, 6-4-fluorophenyl pyridin-3-ylboronic acid, acmc-2098oe PubChem CID: 44755182 IUPAC Name: [6-(4-fluorophenyl)pyridin-3-yl]boronic acid SMILES: B(C1=CN=C(C=C1)C2=CC=C(C=C2)F)(O)O

N-Methyl(5-phenylpyrid-2-yl)methylamine 97%, Maybridge

CAS: 892502-02-2 Molecular Formula: C13H14N2 Molecular Weight (g/mol): 198.269 MDL Number: MFCD10700051 InChI Key: HHOWXRCPAWWJPH-UHFFFAOYSA-N Synonym: n-methyl 5-phenylpyrid-2-yl methylamine, methyl 5-phenylpyridin-2-yl methyl amine, 2-methyl aminomethyl-5-phenylpyridine, 2-pyridinemethanamine,n-methyl-5-phenyl, methyl 5-phenyl 2-pyridyl methyl amine, n-methyl-5-phenylpyridin-2-yl methylamine, n-methyl-1-5-phenylpyridin-2-yl methanamine PubChem CID: 26343606 IUPAC Name: N-methyl-1-(5-phenylpyridin-2-yl)methanamine SMILES: CNCC1=NC=C(C=C1)C2=CC=CC=C2

Alfa Aesar™ 4-Chloro-6-methyl-2-phenylquinoline

CAS: 18618-02-5 Molecular Formula: C16H12ClN Molecular Weight (g/mol): 253.729 MDL Number: MFCD02179777 InChI Key: PFLXBAREWKKMOZ-UHFFFAOYSA-N Synonym: acmc-20aml1, quinoline,4-chloro-6-methyl-2-phenyl PubChem CID: 7022159 IUPAC Name: 4-chloro-6-methyl-2-phenylquinoline SMILES: CC1=CC2=C(C=C1)N=C(C=C2Cl)C3=CC=CC=C3

5-Phenylnicotinic acid, ≥95%, Maybridge

CAS: 10177-12-5 Molecular Formula: C12H9NO2 Molecular Weight (g/mol): 199.209 MDL Number: MFCD03086176 InChI Key: VKFXHYRIHRTEIV-UHFFFAOYSA-N Synonym: 5-phenylnicotinic acid, 3-pyridinecarboxylic acid, 5-phenyl, 5-phenyl-3-pyridinecarboxylic acid, 3-phenyl-5-pyridinecarboxylic acid, 5-phenylnicotinicacid, akos bar-0484, acmc-1bstf, 3-carboxy-5-phenylpyridine, 5-phenylnicotinic acid, 95+%, 3-pyridinecarboxylicacid,5-phenyl PubChem CID: 346160 IUPAC Name: 5-phenylpyridine-3-carboxylic acid SMILES: C1=CC=C(C=C1)C2=CC(=CN=C2)C(=O)O

N-Methyl-N-(3-pyridin-4-ylbenzyl)amine, 97%, Maybridge

CAS: 852180-67-7 Molecular Formula: C13H14N2 Molecular Weight (g/mol): 198.269 InChI Key: PXCMPGTVPUZXRO-UHFFFAOYSA-N Synonym: n-methyl 3-pyridin-4-yl phenyl methanamine, n-methyl-1-3-pyridin-4-yl phenyl methanamine, n-methyl-n-3-pyridin-4-ylbenzyl amine, methyl 3-pyridin-4-yl phenyl methyl amine, n-methyl-1-3-pyridin-4-ylphenyl methanamine, n-methyl-3-pyridin-4-yl benzylamine, n-methyl-n-3-pyridin-4-yl benzylamine, methyl 3-4-pyridyl phenyl methyl amine, 4-3-methylamino methyl phenyl pyridine PubChem CID: 7060574 IUPAC Name: N-methyl-1-(3-pyridin-4-ylphenyl)methanamine SMILES: CNCC1=CC=CC(=C1)C2=CC=NC=C2

5-Phenylpyridine-2-carboxylic acid, 95%, Maybridge

CAS: 75754-04-0 Molecular Formula: C12H9NO2 Molecular Weight (g/mol): 199.209 MDL Number: MFCD04114189 InChI Key: CNCJXSKAKGXNKJ-UHFFFAOYSA-N Synonym: 5-phenylpicolinic acid, 2-pyridinecarboxylic acid, 5-phenyl, 5-phenylpicolinicacid, pubchem22107, 5-phenyl-picolinic acid, acmc-1bb5a, 2-carboxy-5-phenylpyridine, 3-phenyl-6-carboxypyridine, 5-phenyl-2-pyridinecarboxylic acid, 5-phenyl-pyridine-2-carboxylic acid PubChem CID: 2762870 IUPAC Name: 5-phenylpyridine-2-carboxylic acid SMILES: C1=CC=C(C=C1)C2=CN=C(C=C2)C(=O)O

Alfa Aesar™ 2-Amino-5-phenylpyridine, 97%

CAS: 33421-40-8 Molecular Formula: C11H10N2 Molecular Weight (g/mol): 170.215 MDL Number: MFCD01692452 InChI Key: OAPVIBHQRYFYSE-UHFFFAOYSA-N Synonym: 2-amino-5-phenylpyridine, 5-phenyl-2-pyridinamine, 2-pyridinamine, 5-phenyl, phe-p-1, 5-phenyl-pyridin-2-ylamine, 5-phenylpyridin-2-ylamine, 2-amino-5-phenyl pyridine, pyridine, 2-amino-5-phenyl, acmc-1adxr, 5-phenyl-2-pyridylamine PubChem CID: 105097 IUPAC Name: 5-phenylpyridin-2-amine SMILES: C1=CC=C(C=C1)C2=CN=C(C=C2)N

Alfa Aesar™ Tris(2-phenylpyridine)iridium(III)

CAS: 693794-98-8 Molecular Formula: C33H24IrN3-3 Molecular Weight (g/mol): 654.793 MDL Number: MFCD04039766 InChI Key: JAZWLEYGTKXZCJ-UHFFFAOYSA-N Synonym: tris 2-phenylpyridine iridium iii PubChem CID: 71433583 IUPAC Name: iridium;2-phenylpyridine SMILES: C1=CC=C([C-]=C1)C2=CC=CC=N2.C1=CC=C([C-]=C1)C2=CC=CC=N2.C1=CC=C([C-]=C1)C2=CC=CC=N2.[Ir]

{4-[5-(Trifluoromethyl)pyrid-2-yl]phenyl}methylamine, 97%, Maybridge

CAS: 906352-74-7 Molecular Formula: C13H11F3N2 Molecular Weight (g/mol): 252.24 MDL Number: MFCD09817478 InChI Key: XQAJYHFQYZEWSE-UHFFFAOYSA-N Synonym: 4-5-trifluoromethyl pyridin-2-yl benzylamine, 4-5-trifluoromethyl pyrid-2-yl phenyl methylamine, 4-5-trifluoromethyl pyridin-2-yl phenyl methanamine, 4-5-trifluoromethyl pyridin-2-yl phenyl methylamine, 1-4-5-trifluoromethyl pyridin-2-yl phenyl methanamine, 4-5-trifluoromethyl-2-pyridyl phenyl methylamine, 2-4-aminomethyl phenyl-5-trifluoromethyl pyridine PubChem CID: 24229534 IUPAC Name: [4-[5-(trifluoromethyl)pyridin-2-yl]phenyl]methanamine SMILES: C1=CC(=CC=C1CN)C2=NC=C(C=C2)C(F)(F)F

N-Methyl(6-phenylpyrid-3-yl)methylamine, 97%, Maybridge

CAS: 879896-40-9 Molecular Formula: C13H14N2 Molecular Weight (g/mol): 198.269 MDL Number: MFCD09064942 InChI Key: OLZSHISXLYLLBI-UHFFFAOYSA-N Synonym: n-methyl 6-phenylpyrid-3-yl methylamine, methyl 6-phenylpyridin-3-yl methyl amine, 3-pyridinemethanamine,n-methyl-6-phenyl, methyl 6-phenyl 3-pyridyl methyl amine, n-methyl-1-6-phenylpyridin-3-yl methanamine PubChem CID: 24229465 IUPAC Name: N-methyl-1-(6-phenylpyridin-3-yl)methanamine SMILES: CNCC1=CN=C(C=C1)C2=CC=CC=C2

2,6-Diphenylisonicotinic acid, 97%, ACROS Organics™

CAS: 38947-57-8 Molecular Formula: C18H13NO2 Molecular Weight (g/mol): 275.3 MDL Number: MFCD00418438 InChI Key: PWKUURSWFJBXGO-UHFFFAOYSA-N Synonym: 2,6-diphenylisonicotinic acid, 2,6-diphenyl-4-pyridinecarboxylic acid, 4-pyridinecarboxylicacid, 2,6-diphenyl, 4-pyridinecarboxylic acid, 2,6-diphenyl, 2 6-diphenylisonicotinic acid 97 PubChem CID: 3490694 IUPAC Name: 2,6-diphenylpyridine-4-carboxylic acid SMILES: C1=CC=C(C=C1)C2=CC(=CC(=N2)C3=CC=CC=C3)C(=O)O

Alfa Aesar™ 4-Phenylpyridine-2-thiocarboxamide, 97%

CAS: 150223-58-8 Molecular Formula: C12H10N2S Molecular Weight (g/mol): 214.286 MDL Number: MFCD22683007 InChI Key: ZVJKVMYMCJFXAE-UHFFFAOYSA-N Synonym: 4-phenylpyridine-2-thiocarboxamide PubChem CID: 86165220 IUPAC Name: 4-phenylpyridine-2-carbothioamide SMILES: C1=CC=C(C=C1)C2=CC(=NC=C2)C(=S)N

(3-Pyrid-4-ylphenyl)methanol, 97%, Maybridge

CAS: 85553-55-5 Molecular Formula: C12H11NO Molecular Weight (g/mol): 185.226 MDL Number: MFCD06659083 InChI Key: ZORHPGKUTIFODF-UHFFFAOYSA-N Synonym: 3-pyrid-4-ylphenyl methanol, 3-pyridin-4-yl phenyl methanol, 3-pyridin-4-yl benzyl alcohol, benzenemethanol,3-4-pyridinyl, 3-pyridin-4-ylphenyl methanol, 3-4-pyridyl phenyl methan-1-ol, benzenemethanol, 3-4-pyridinyl, 4-3-hydroxymethyl phenyl pyridine PubChem CID: 2795564 IUPAC Name: (3-pyridin-4-ylphenyl)methanol SMILES: C1=CC(=CC(=C1)CO)C2=CC=NC=C2

3-Pyrid-4-ylbenzoic acid, 97%, Maybridge

CAS: 4385-78-8 Molecular Formula: C12H9NO2 Molecular Weight (g/mol): 199.209 InChI Key: IYGIZNZSONLPSI-UHFFFAOYSA-N Synonym: 3-pyridin-4-yl benzoic acid, 3-pyridin-4-yl-benzoic acid, 3-pyrid-4-ylbenzoic acid, 3-4-pyridyl benzoic acid, 4-3-carboxyphenyl pyridine, 3-4-pyridinyl benzoic acid, 3-pyridin-4-yl benzoic aci, benzoic acid,3-4-pyridinyl, 5fl PubChem CID: 2795562 IUPAC Name: 3-pyridin-4-ylbenzoic acid SMILES: C1=CC(=CC(=C1)C(=O)O)C2=CC=NC=C2

Alfa Aesar™ 4-(4-Pyridyl)benzaldehyde, 97%

CAS: 99163-12-9 Molecular Formula: C12H9NO Molecular Weight (g/mol): 183.21 MDL Number: MFCD02684110 InChI Key: MBJXDIYHLGBQOT-UHFFFAOYSA-N Synonym: 4-pyridin-4-yl-benzaldehyde, 4-pyridin-4-yl benzaldehyde, 4-4-pyridyl benzaldehyde, 4-4-pyridinyl benzaldehyde, 4-4-formylphenyl pyridine, akos bar-0607, benzaldehyde, 4-4-pyridinyl, acmc-209sbt PubChem CID: 639673 IUPAC Name: 4-pyridin-4-ylbenzaldehyde SMILES: C1=CC(=CC=C1C=O)C2=CC=NC=C2

4-Phenylpyridine, 99%, ACROS Organics™

CAS: 939-23-1 Molecular Formula: C11H9N Molecular Weight (g/mol): 155.2 MDL Number: MFCD00006420 InChI Key: JVZRCNQLWOELDU-UHFFFAOYSA-N Synonym: pyridine, 4-phenyl, p-phenylpyridine, 4-phenyl-pyridine, 4-azabiphenyl, unii-452kd9ycg7, 4-aza-1,1'-biphenyl, phenyl-pyridine, 4-phenylpyridin, 4-pyridylbenzene, zlchem 480 PubChem CID: 13651 IUPAC Name: 4-phenylpyridine SMILES: C1=CC=C(C=C1)C2=CC=NC=C2

2-[4-(Chloromethyl)phenyl]-5-(trifluoromethyl)pyridine, 95%, Maybridge

CAS: 613239-76-2 Molecular Formula: C13H9ClF3N Molecular Weight (g/mol): 271.667 MDL Number: MFCD09817479 InChI Key: JTXHHQDYEHXWPC-UHFFFAOYSA-N Synonym: 2-4-chloromethyl phenyl-5-trifluoromethyl pyridine, 4-5-trifluoromethyl pyridin-2-yl benzyl chloride, 2-4-chloromethyl-phenyl 5-trifluoromethyl-pyridine, 2-4-chloromethyl-phenyl-5-trifluoromethyl-pyridine PubChem CID: 22280067 IUPAC Name: 2-[4-(chloromethyl)phenyl]-5-(trifluoromethyl)pyridine SMILES: C1=CC(=CC=C1CCl)C2=NC=C(C=C2)C(F)(F)F

4-Pyrid-4-ylbenzoic acid, 95%, Maybridge

CAS: 4385-76-6 Molecular Formula: C12H9NO2 Molecular Weight (g/mol): 199.209 MDL Number: MFCD04114574 InChI Key: DZLGZIGLHCRIMF-UHFFFAOYSA-N Synonym: 4-pyridin-4-yl-benzoic acid, 4-4-pyridyl benzoic acid, 4-pyridin-4-yl benzoic acid, 4-pyrid-4-ylbenzoic acid, 4-4-pyridinyl benzoic acid, 4-4-carboxyphenyl pyridine, 4'-pyridyl-4-benzoic acid, benzoic acid, 4-4-pyridinyl, pubchem22345, acmc-1adxv PubChem CID: 1520811 IUPAC Name: 4-pyridin-4-ylbenzoic acid SMILES: C1=CC(=CC=C1C2=CC=NC=C2)C(=O)O

2-(3-Bromophenyl)pyridine, 97%, Acros Organics™

CAS: 4373-60-8 Molecular Formula: C11H8BrN Molecular Weight (g/mol): 234.1 InChI Key: WLPFTJXVEBANAM-UHFFFAOYSA-N Synonym: 2-3-bromophenyl pyridine, pyridine, 2-3-bromophenyl, 2-3-bromo-phenyl-pyridine, 2-3'-bromophenyl pyridine, 3-2-pyridinyl phenyl bromide, 3,5-pyrid-2-yl bromobenzene PubChem CID: 11115506 IUPAC Name: 2-(3-bromophenyl)pyridine SMILES: C1=CC=NC(=C1)C2=CC(=CC=C2)Br

4-Pyrid-3-ylbenzaldehyde, 97%, Maybridge

CAS: 127406-55-7 Molecular Formula: C12H9NO Molecular Weight (g/mol): 183.21 MDL Number: MFCD01631910 InChI Key: NXZUVHZZIZHEOP-UHFFFAOYSA-N Synonym: 4-pyridin-3-yl benzaldehyde, 4-pyridin-3-yl-benzaldehyde, 4-3-pyridyl benzaldehyde, 4-3-pyridinyl benzaldehyde, 4-pyrid-3-ylbenzaldehyde, benzaldehyde, 4-3-pyridinyl, acmc-1byq9, 3-4-formylphenyl pyridine PubChem CID: 3693046 IUPAC Name: 4-pyridin-3-ylbenzaldehyde SMILES: C1=CC(=CN=C1)C2=CC=C(C=C2)C=O

{4-[5-(Trifluoromethyl)pyrid-2-yl]phenyl}methanol, 97%, Maybridge

CAS: 613239-75-1 Molecular Formula: C13H10F3NO Molecular Weight (g/mol): 253.224 MDL Number: MFCD09817477 InChI Key: VRVOASJNEFKGGI-UHFFFAOYSA-N Synonym: 4-5-trifluoromethyl pyridin-2-yl phenyl methanol, 4-5-trifluoromethyl pyridin-2-yl benzyl alcohol, 4-5-trifluoromethyl-2-pyridinyl phenyl methanol, 4-5-trifluoromethyl pyrid-2-yl phenyl methanol, 4-5-trifluoromethyl-pyridin-2-yl-phenyl-methanol, 4-5-trifluoromethyl-2-pyridyl phenyl methan-1-ol PubChem CID: 22280022 IUPAC Name: [4-[5-(trifluoromethyl)pyridin-2-yl]phenyl]methanol SMILES: C1=CC(=CC=C1CO)C2=NC=C(C=C2)C(F)(F)F

Alfa Aesar™ 2-Chloro-3-cyano-5-phenylpyridine, 98%

CAS: 10177-10-3 Molecular Formula: C12H7ClN2 Molecular Weight (g/mol): 214.652 MDL Number: MFCD00231610 InChI Key: DBOYDCQWVLJOJG-UHFFFAOYSA-N Synonym: 2-chloro-5-phenylnicotinonitrile, 2-chloro-3-cyano-5-phenylpyridine, 2-chloro-5-phenyl-pyridine-3-carbonitrile, 3-pyridinecarbonitrile, 2-chloro-5-phenyl, acmc-20anyy, chlorophenylnicotinonitrile PubChem CID: 2764043 IUPAC Name: 2-chloro-5-phenylpyridine-3-carbonitrile SMILES: C1=CC=C(C=C1)C2=CN=C(C(=C2)C#N)Cl

N-Methyl-N-(3-pyridin-3-ylbenzyl)amine, 97%, Maybridge

CAS: 852180-72-4 Molecular Formula: C13H14N2 Molecular Weight (g/mol): 198.269 MDL Number: MFCD07368550 InChI Key: LZJRRTLTBULOHU-UHFFFAOYSA-N Synonym: n-methyl-n-3-pyridin-3-ylbenzyl amine, methyl 3-pyridin-3-yl phenyl methyl amine, n-methyl-n-3-pyridin-3-yl benzylamine, benzenemethanamine,n-methyl-3-3-pyridinyl, n-methyl-1-3-pyridin-3-yl phenyl methanamine, n-methyl-1-3-pyridin-3-ylphenyl methanamine, n-methyl-3-pyridin-3-yl benzylamine, methyl 3-3-pyridyl phenyl methyl amine, 3-3-methylamino methyl phenyl pyridine PubChem CID: 7060576 IUPAC Name: N-methyl-1-(3-pyridin-3-ylphenyl)methanamine SMILES: CNCC1=CC=CC(=C1)C2=CN=CC=C2

6-Phenylnicotinaldehyde, 97%, Maybridge

CAS: 63056-20-2 Molecular Formula: C12H9NO Molecular Weight (g/mol): 183.21 MDL Number: MFCD03086130 InChI Key: HWDMDOSKSDLXEH-UHFFFAOYSA-N Synonym: 6-phenylnicotinaldehyde, 6-phenylpyridine-3-carboxaldehyde, 2-phenyl-5-pyridinecarboxaldehyde, 6-phenyl-3-pyridinecarboxaldehyde, 3-pyridinecarboxaldehyde, 6-phenyl, 2-phenylpyridine-5-carbaldehyde, 6-phenyl-pyridine-3-carbaldehyde PubChem CID: 2764562 IUPAC Name: 6-phenylpyridine-3-carbaldehyde SMILES: C1=CC=C(C=C1)C2=NC=C(C=C2)C=O

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