ISOAMYL ALCOHOL Grade:ULTRA PURE GRADE CAS Number: 123-51-3Synonym(s): None Molecular Weight: 88.15Molecular Formula: C5H11OH Storage Condition: ROOM TEMPERATURE CodeSizePriceQuantity 0944-1L Purity >99.0%. Isoamyl Alcohol is a common alcohol used in the purification of DNA. A small amount of isoamyl alcohol is often added to phenol chloroform mixtures to ensure deactivation of RNase activity and reduce foaming.