1498-89-1 NSC206175 Spiro[2H-1-benzopyran-2,2'-[2H]indole], 1',3'-dihydro-8-methoxy-1',3',3'-trimethyl-6-nitro- Spiro[2H-1-benzopyran-2,2'-indoline], 8-methoxy-1',3',3'-trimethyl-6-nitro-