英文别名(6RS)-5,10-diformyl-5,6,7,8-tetrahydrofolic acid; Folinic Acid EP Impurity B; Folinic Acid EP Impurity B (Mixture of Diastereomers); Calcium levofolinate impurity; N-[4-[[(2-amino-5-formyl-1,4,5,6,7,8-hexahydro-4-oxo-6-pteridinyl)methyl]formylamino]benzoyl]-L-glutamic acid 
