CC(=O)N[C@H](C(=O)[O-])C(C)(C)S    mol694    -1_1
CC(=O)N[C@H](C(=O)O)C(C)(C)[S-]    mol694    -1_2
CC(=O)N[C@H](C(=O)[O-])C(C)(C)[S-]    mol694    -2_1