2H-3,1-Benzoxazine-2,4(1H)-dione, 6-chloro- 4743-17-3 5-Chloroisatoic anhydride 6-Chloro-4H-3,1-benzoxazine-2,4(1H)-dione AI3-61136 EINECS 225-255-7 NSC 139890 NSC 75847