0 B11R1.21 CC1=[N+]([O-])C=C(C(=O)O)N=C1 DB09055 [0,0,0,0,0,1|3,0,0]=4 1 B11R1.74 O=C1C=C(C(=O)O)NC(=O)N1 DB02262 [0,0,0,0,0,1|3,0,0]=4