1492-18-8 (CALCIUM) 58-05-9 (FREE ACID) AIDS-007254 AIDS007254 Citrovoeum factor DW385 Folinic Acid Folinic acid-SF L-(+)-Folinic acid Leucal Leucovorin N-[4-[[(2-Amino-5-formyl-1,4,5,6,7,8-hexahydro-4-oxo-6(RS)-pteridinyl)methyl]amino]benzoyl]-L-glutamic acid NSC3590 (CALCIUM) SD-204098 Welcovorin