2-Amino-3-oxo-3H-phenoxazine-4,6-dicarboxylic acid dimethyl ester 35748-35-7 3H-Phenoxazine-4,6-dicarboxylic acid, 2-amino-3-oxo-, dimethyl ester NSC83081 WLN: T C666 BO EV INJ DVO1 FZ NVO1