these effects appear to be specific for the methotrexate-tetrahydrofolate carrier system since the transport of other compounds which utilize this carrier , aminopterin , 5-methyltetrahydrofolate , and 5-formyltetrahydrofolate , is affected similarly to methotrexate , whereas , the transport of folic acid , a compound similar in structure and charge but not significantly transported by this carrier is unaffected by liposomes .
C0002583
aminopterin
C0025677
methotrexate