methotrexate , ( 0.5 mg/kg ) , aminopterin , ( 0.1 mg/kg ) , and acetylsalicylic acid , ( 25 or 50 mg/kg ) were administered orally in gelatin capsules in single daily doses on different days of gestation , methotrexate ( mtx ) on days 11-14 , 14-17 , or 17-20 , aminopterin on day 12 , 14 , or 16 , and acetylsalicylic acid ( asa ) on days 10-15 or 15-20 .
C0025677
methotrexate
C0002583
aminopterin