1'-(2-methoxyethyl)-3',3'-dimethylspiro[benzo[f][1,4]benzoxazine-3,2'-indole]-9-carboxylic acid 、
2,2,6,6-Tetramethyl-4-hydroxy-piperidin-1-oxyl 生成 (2,2,6,6-tetramethyl-1-oxopiperidin-1-ium-4-yl) 1'-(2-methoxyethyl)-3',3'-dimethylspiro[benzo[f][1,4]benzoxazine-3,2'-indole]-9-carboxylate