NOTES 663 1 dures have given a series of peptides. All the data obtained can be rationalized by a unique sequence which forms a ring containing ten amino acids.Pteroic acid, 9-[ (Z-amino-4-hydroxy-6-pteridylmethyl)-amino]-benzoic acid, is a part of folic acid and is itself active for S. faecalis R2. Since simple modifications of the purines that occur in nucleic acids produce compounds with striking physiological properties, such as, for example, B-mercaptopurine and azaguanine, it seemed to us to be interesting to prepare an analog of pteroic acid in which the pyrazine moiety is replaced by an imidazole ring:
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.