- Synthesis and biological activity of an acyclic analogue of 5,6,7,8-tetrahydrofolic acid, N-[4-[[3-(2,4-diamino-1,6-dihydro-6-oxo-5- pyrimidinyl)propyl]amino]-benzoyl]-L-glutamic acid. Kelley, J.L., McLean, E.W., Cohn, N.K., Edelstein, M.P., Duch, D.S., Smith, G.K., Hanlon, M.H., Ferone, R. J. Med. Chem. (1990)