6,8'-dimethoxy-3,3'-dimethyl-6'-nitro-3H-spiro[1,3-benzothiazole-2,2'-chromene] InChI=1/C19H18N2O5S/c1-11-7-12-8-13(21(22)23)9-16(25-4)18(12)26-19(11)20(2)15-6-5-14(24-3)10-17(15)27-19/h5-10H,1-4H spiro[2H-1-benzopyran-2,2'(3'H)-benzothiazole], 6',8-dimethoxy-3,3'-dimethyl-6-nitro-