tetrahydropterin

5,6,7,8-Tetrahydropterin

2-Amino-5,6,7,8-tetrahydro-4-pteridinol

2-Amino-5,6,7,8-tetrahydropteridin-4(3H)-one

2-Amino-5,6,7,8-tetrahydro-4(1H)-pteridinone