The molecule is a 6-lactoyl-5,6,7,8-tetrahydropterin in which the stereocentre at position 6 has R-configuration. It is a 6-lactoyl-5,6,7,8-tetrahydropterin and a secondary alpha-hydroxy ketone.
(6R)-2-amino-6-(2-hydroxypropanoyl)-5,6,7,8-tetrahydro-3H-pteridin-4-one