4-aminopteridine 3-oxide

3-氨基吡嗪羧酸苄酯

4-(N,N-dimethylaminomethyleneamino)pteridine 3-oxide

1,2-dihydro-pyrazolo[3,4-b]pyrazin-3-one

2-amino-3-(1',2',4'-oxadiazolyl-3')pyrazine