We are offering ethyl-2-methyl-4-pentenoate ester. Flavor and fragrance agents.Product Name: Bis-PE21- NHS ester Synonyms: Bis-PE21- NHS ester;Bis-PEG10-NHS ester;Bis-PEG13-NHS ester;Bis-PEG17-NHS ester;Bis-PEG25-NHS ester;Bis-PEG9-NHS ester CAS: 1008402-79-6 MF: MW: 0 EINECS