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

Which of the following classes is one valid superclass of '(6R,7R,8S)-7-[4-[3-(dimethylamino)prop-1-ynyl]phenyl]-4-[(4-fluorophenyl)-oxomethyl]-8-(hydroxymethyl)-1,4-diazabicyclo[4.2.0]octan-2-one'?

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

Answer: ring assembly