With hetero atoms or with carbon atoms having three bonds to hetero

Official title: with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms

C07D207/10 (With hetero atoms or with carbon atoms having three bonds to hetero) appears on 3,395 US grants and 3,410 published applications in this corpus.