Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'capsazepine'?

A. A benzazepine that is 2,3,4,5-tetrahydro-1H-2-benzazepine which is substituted by hydroxy groups at positions 7 and 8 and on the nitrogen atom by a 2-(p-chlorophenyl)ethylaminothiocarbonyl group. A synthetic analogue of capsaicin, it was the first reported capsaicin receptor antagonist.
B. An enamide resulting from the formal condensation of (2Z)-3-(4-chlorophenyl)-3-(3,4-dimethoxyphenyl)acrylic acid with the amino group of morpholine. The agricultural fungicide dimethomorph is a mixture of (E)- and the concept; only the Z isomer has fungicidal activity.
C. An N-alkylpiperazine carrying (4-chlorophenyl)(phenyl)methyl and 4-tert-butylbenzyl groups.
D. A quinolone that is 1-methylquinolin-2-one which carries a 3-chlorophenyl and an amino(4-chlorophenyl)(1-methyl-imidazol-5-yl)methyl groups at the 4 and 6 positions, respectively (the R-isomer).

Answer: A benzazepine that is 2,3,4,5-tetrahydro-1H-2-benzazepine which is substituted by hydroxy groups at positions 7 and 8 and on the nitrogen atom by a 2-(p-chlorophenyl)ethylaminothiocarbonyl group. A synthetic analogue of capsaicin, it was the first reported capsaicin receptor antagonist.