0  B6R1.2  CC1=CNN=C1 DB01213 [1,0,0,0,0,0|3,0,0]=4
1  B5R0.5  CC(=O)C(O)=O DB00119 [0,0,1,0,1,0|1,0,0]=3
2  B5R0.5  CC(O)C(O)=O DB04398 [0,0,1,0,1,0|1,0,1]=4
3  B5R0.5  CC(O)C([O-])=O DB06768 [0,0,1,0,1,0|1,0,1]=4