1-Methyl-2H-3,1-benzoxazine-2,4(1H)-dione 10328-92-4 2-27-00-00299 (Beilstein Handbook Reference) 2H-3,1-BENZOXAZINE-2,4(1H)-DIONE, 1-METHYL- AI3-61135 BRN 0383957 EINECS 233-714-8 N-Methyl IA N-Methyl-N-carboxyanthranilic anhydride N-Methylisatoic anhydride NSC 76087