6809-94-5 BRN 1957075 Bicyclo(4.2.0)octa-1,3,5-trien-7-yl phenyl ketone Bicyclo(4.2.0)octa-1,3,5-triene, 7-benzoyl- KETONE, BICYCLO(4.2.0)OCTA-1,3,5-TRIEN-7-YL PHENYL