Title: Diopterin CAS Registry Number: 6807-82-5 CAS Name: N-[N-[4-[[(2-Amino-1,4-dihydro-4-oxo-6-pteridinyl)methyl]amino]benzoyl]-L-a-glutamyl]-L-glutamic acid Additional Names: pteroyl-a-glutamylglutamic acid; pteroyldiglutamic acid; PDGA Molecular Formula: C24H26N8O9 Molecular Weight: 570.51 Percent Composition: C 50.53%, H 4.59%, N 19.64%, O 25.24% Literature References: Folic acid analog. Synthesis: Mowat et al., J. Am. Chem. Soc. 70, 1096 (1948); Hutchings, and Geraci, US 2500825 and US 2501168 (both 1950 to Am. Cyanamid); Geraci, US 2766240 (1956 to Aries Labs.). Properties: Precipitate from hot water. Sol in dil NaOH solns.

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