1,2,3-Propanetricarboxylic acid, 2-hydroxy-, tributyl ester 2-Hydroxy-1,2,3-propanetricarboxylic acid, tributyl ester 77-94-1 Butyl citrate Citric acid, tributyl ester Citroflex 4 NSC8491 Tri-n-butyl citrate Tributyl citrate n-Butyl citrate