C CHEMISTRY; METALLURGY
C07 ORGANIC CHEMISTRY
C07D HETEROCYCLIC COMPOUNDS
263/00 Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
C07D263/02 not condensed with other rings
C07D263/08 having one double bond between ring members or between a ring member and a non-ring member
C07D263/16 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
C07D263/20 attached in position 2