1,3-DIOXOLANE, 2,2,4-TRIMETHYL- 1193-11-9 2,2,4-Trimethyl-1,3-dioxacyclopentane 2,2,4-Trimethyl-1,3-dioxolane 2,2,4-Trimethyl-1,3-oxacyclopentane Acetone propylene glycol acetal EINECS 214-766-0 FEMA No. 3441 NSC 87545 Propylene glycol acetone ketal