1075-30-5 BRN 2044508 Bicyclo(4.2.0)octa-1,3,5-trien-7-yl methyl ketone Bicyclo(4.2.0)octa-1,3,5-triene, 7-acetyl- KETONE, BICYCLO(4.2.0)OCTA-1,3,5-TRIEN-7-YL METHYL