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

Which of the following classes is one valid superclass of 'N-[(3R,9S,10S)-9-[(dimethylamino)methyl]-12-[(2S)-1-hydroxypropan-2-yl]-3,10-dimethyl-13-oxo-2,8-dioxa-12-azabicyclo[12.4.0]octadeca-1(14),15,17-trien-16-yl]cyclohexanecarboxamide'?

A. ((13)C)carbon dioxide
B. ((2-bromo-4-methylphenyl){6-[(4-{[(2R)-3-(dimethylamino)-2-hydroxypropyl]oxy}phenyl)amino]pyrimidin-4-yl}amino)acetonitrile
C. ((2-bromo-4-methylphenyl){6-[(4-{[(2S)-3-(dimethylamino)-2-hydroxypropyl]oxy}phenyl)amino]pyrimidin-4-yl}amino)acetonitrile
D. lactam

Answer: lactam