6.3
[]. Aleem Gangjee, et al. Synthesis of classical, three-carbon-bridged 5-substituted furo[,3-d]pyrimidine and 6-substituted pyrrolo[,3-d]pyrimidine analogues as antifolates. J Med Chem. 4 Dec 3;47(7):6893-9.
H35-H39-H335
P6-P64-P7-P8-P3+P35-P34+P34-P36+P364-P45-P5
GHS7