63998-89-0

Spiro[2H-1-benzopyran-2,2'-[2H]indole]-1'(3'H)-propanoicacid, 3',3'-dimethyl-6-nitro-, anhydride with3',3'-dimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-[2H]indole]-1'(3'H)-propanoicacid