polysubstituted pyrimidines多取代嘧啶
polysubstituted pyrimidine嘧啶
polysubstituted pyridine多取代吡啶
polysubstituted alkenes多取代烯烃
polysubstituted olefin多取代烯烃
polysubstituted pyrroles多取代吡咯
polysubstituted pyrrole多取代吡咯
polysubstituted cyclopentadiene多取代环戊二烯
Polysubstituted benzenes多取代苯