Figure 1. Chemical structures of selected phenolic compounds from S. tuberculatiformis, and their synthetic analog, Compound A.

A–C. Chemical structures of selected bio-active phenolic compounds isolated from S. tuberculatiformis Botch extracts, D. an inactive compound, [2-(hydroxy)-2-(4-hydroxyphenyl)-ethyl]-methyl ammonium chloride (synephrine), and E. a synthetic analog 2-(4-acetoxyphenyl)-2-chloro-N-ethyl ammonium chloride (Compound A). See also [111] for additional details.