... hydrochloride (FMGBaHCI) and fluorescein di-p-guanidinobenzoate dihydrochloride (FDGB-ZHCI), have been synthesized, purified, and chemically and enzymatically ... 0002-7863/82/ 1504-7299$01.25/0 0 1982 American Chemical Society Page 2. ... 1971, (34) Gurien, ...