phosphoarginine

noun

phos·​pho·​ar·​gi·​nine ˌfäs-(ˌ)fō-ˈär-jə-ˌnēn 

: a compound C₆H₁₅N₄O₅P of arginine and phosphoric acid that functions in various invertebrates (as crustaceans) in a way similar to that of phosphocreatine in vertebrates