Tetrahydrobiopterin analogs: the solution conformations of 6-methyltetrahydropterin, 7-methyltetrahydropterin, and cis- and trans-6,7-dimethyltetrahydropterins as determined by proton nuclear magnetic resonance
1961 ◽
Vol 83
(7)
◽
pp. 1671-1675
◽
1984 ◽
Vol 259
(24)
◽
pp. 15085-15088