有一种二肽，化学式是C 8H 14N 2O 5，水解后得到丙氨酸（R基为—CH 3）和另一种氨基酸M，则M的R基的化学式是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21851' and id < 1909485 and id<>'1909485' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21851' and id > 1909485 and id<>'1909485' order by id asc limit 5