Robuta

https://www.sigmaaldrich.com/US/en/product/usp/1618003
Spectinomycin hydrochloride United States Pharmacopeia (USP) Reference Standard; CAS Number: 22189-32-8; Synonyms: Spectinomycin dihydrochloride pentahydrate...
spectinomycin hydrochloridereference standardsigma aldrichusp