1,purity >>98%.] 2,colorless to yellowish liquid Ethyl (r)-(-)-4-cyano-3-hydroxybutyrate/141942-85-0 Cas no.:141942-85-0 Assay:98.0%minEthyl (r)-(-)-4-cyano-3-hydroxybutyrate/141942-85-0Cas no.:141942-85-0Assay:98.0%minAppearance:Colorless or light yellow transparent liquid.Usage: Pharmaceutical for atorvastatin calcium. Ethyl (R)-(-)-4-cyano-3-hydroxybutyate