<jats:title>Abstract</jats:title> <jats:p>The structure of N8-methylsepiapterin was previously postulated for a new pteridine from Bombyx mori lemon (This Bulletin, 38, 503 (1965)). This structure must, however, be modified on the basis of some new experiments. We will now present the 7, 8-dihydro-6-lactyllumazine structure for this compound.