Noun
English Wikipedia has an article on:butylparabenWikipedia
butylparaben (uncountable)
A paraben, the butyl ester of p-hydroxybenzoic acid, used as an antifungal preservative in cosmetics.
For instance, many version of hyaluronic acid in solution on the market today are preserved with Phenonip, which contains Phenoxyethanol, Methylparaben, Butylparaben, Ethylparaben, Propylparaben. Source: Internet