2-Hydroxy-1,2,3-propanetricarboxylic Acid 2-Butyl Ester-d9 is labelled 2-Hydroxy-1,2,3-propanetricarboxylic Acid 2-Butyl Ester (H952255) which is an isomer of 2-Hydroxy-1,2,3-propanetricarboxylic Acid 1-Butyl Ester (H952250). 2-Hydroxy-1,2,3-propanetricarboxylic Acid 1-Butyl Ester (H952250) is a plasticizer.