我们要的是在醛固酮上添加一个羧基，便于与其他的生物分子上的氨基进行偶联。效果好，后期会有大量订购

2-((((8S,9S,10R,11S,13R,14S,17S,E)-13-formyl-11-hydroxy-17-(2-hydroxyacetyl)-10-methyl-1,2,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-3H-cyclopenta[a]phenanthren-3-ylidene)amino)oxy)acetic acid
Chemical Formula: C23H31NO7
Molecular Weight: 433.5010
m/z: 433.2101 (100.0%), 434.2134 (24.9%), 435.2168 (3.0%), 435.2143 (1.4%)
Elemental Analysis: C, 63.73; H, 7.21; N, 3.23; O, 25.83