1,4,6,6,8,8-Hexamethyl-as-hydrindacene-3-one 1,6,7,8-Tetrahydro-1,4,6,6,8,8-hexamethyl-as-indacen-3(2H)-one 68298-33-9 EINECS 269-556-1 as-Indacen-3(2H)-one, 1,6,7,8-tetrahydro-1,4,6,6,8,8-hexamethyl-