释义 |
双向☞ ethylenedicarboxylic acid-- amber acid--succinic acid双向☞ amber acid--ethylenedicarboxylic acid--succinic acid双向☞ethylenedicarboxylic acid--succinic acid--amber acid双向☞ethylenedicarboxylic acid-- succinic acid双向☞succinic acid-- ethylenedicarboxylic acid |