1'-(2-methoxyethyl)-3',3'-dimethylspiro[benzo[f][1,4]benzoxazine-3,2'-indole]-9-ol 、
2,2,5,5-Tetramethylpiperidine-1-oxyl-3-carboxylic acid 生成 [1'-(2-methoxyethyl)-3',3'-dimethylspiro[benzo[f][1,4]benzoxazine-3,2'-indole]-9-yl] 2,2,5,5-tetramethyl-1-oxopyrrolidin-1-ium-3-carboxylate