O=C([C@H](CC1=CNC=N1)N)O(His) H
Properties:
- Basic
- Functional group is an imidazole
- Anionic histidine can tautomerize to form the anionic tautomer as opposed to the usually seen anionic tautomer (ACS article):
O=C([C@H](CC1=CN=CN1)N)OO=C([C@H](CC1=CNC=N1)N)O(His) H
O=C([C@H](CC1=CN=CN1)N)O