6813-93-0 BRN 2271493 Bicyclo(4.2.0)octa-1,3,5-trien-7-yl methyl ketone O-acetyloxime KETONE, BICYCLO(4.2.0)OCTA-1,3,5-TRIEN-7-YL METHYL, O-ACETYLOXIME O-Acetyl-1-acetylbenzocyclobutene oxime