64036-48-2 BRN 1493136 Spiro(5H-dibenzo(a,d)cycloheptene-5,3'-pyrrolidine)-2',5'-dione, 10,11-dihydro-1'-methyl- Spiro(dibenzo(a,d)cycloheptadiene-5,3'-pyrrolidine)-1'-methyl-2',5'-dione