2-Pivaloylamino-6-formylpteridin-4-one

2-amino-6-(D-arabino-tetrahydroxybutyl)pteridin-4(3H)-one

3-amino-6-(dimethoxymethyl)pyrazine-2-carbonitrile

2-amino-4-oxo-5,8-dihydro-1H-pteridine-6-carbaldehyde

2-pivaloylamino-6-chloropteridine