<prompt> Folinic acid is:5-formyl tetrahydrofolate5-formyl dihydrofolateN5, N10-methylene tetrahydrofolateN5, N10-methylene dihydrofolate  <response>: Folinic acid is 5-formyltetrahydrofolate. It is also known as leucovorin and citrovorum factor. Folinic acid can be directly conveed to N5, N10-methylene tetrahydrofolate. Extra:-When methotrexate is used for chemotherapy, normal cells are also affected. Folinic acid is administered to rescue the normal cells from the toxic effect of methotrexate. 