Pregn-4-en-18-al,21-hydroxy-11-(hydroxymethyl)- 3,20-dioxo-,cyclic 18,11-hemiacetal,(11â)- is a chemical compound registered under CAS number 86699-13-0. DeWeiChem supplies Pregn-4-en-18-al,21-hydroxy-11-(hydroxymethyl)- 3,20-dioxo-,cyclic 18,11-hemiacetal,(11â)- for laboratory research and bulk production; product code 365899. Send an inquiry for purity, packaging, price and lead time.