752-56-7 CCRIS 5849 EINECS 212-034-5 Hibon Riboflavin 2',3',4',5'-tetrabutyrate Riboflavin tetrabutyrate Riboflavin, 2',3',4',5'-tetrabutanoate Riboflavin, 2',3',4',5'-tetrabutyrate Riboflavine tetrabutyrate