3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl isobutyrate 67634-20-2 EINECS 266-825-5 Hexahydro-4,7-methanoinden-5(or 6)-yl isobutyrate Propanoic acid, 2-methyl-, 3a,4,5,6,7,7a-hexahydro-4,7-methano-1H-inden-5-yl ester Tricyclo(5.2.1.02,6)dec-3-en-9-yl isobutyrate