Compounds being unsubstituted in position 3 or with substituents other than only

Official title: Compounds being unsubstituted in position 3 or with substituents other than only two methyl radicals attached in position 3, and with a carbon atom having three bonds to hetero atoms with at the most one bond to halogen, e.g. an ester or nitrile radical, directly attached in position 2

C07D499/87 (Compounds being unsubstituted in position 3 or with substituents other than only) appears on 3 US grants and 6 published applications in this corpus.