6813-91-8 BRN 2446452 Bicyclo(4.2.0)octa-1,3,5-trien-7-yl methyl ketone O-methyloxime KETONE, BICYCLO(4.2.0)OCTA-1,3,5-TRIEN-7-YL METHYL, O-METHYLOXIME O-Methyl-1-acetylbenzocyclobutene oxime