USAF CB-25

5,6-Dihydro-5-thioxo-3H-1,2,3-triazolo[4,5-d]pyrimidin-7(4H)-one

1,4,5,6-tetrahydro-5-thioxo-7H-1,2,3-triazolo[4,5-d]pyrimidin-7-one