Alice A. Ball, The Chemical Constituents of Piper Methysticum (1915)
“ The crystalline product consists, largely of methysticin, the methyl ester of methysticinic acid. In addition to this there is about five percent of the free methysticinic acid present.The resinous product consists of about five percent of free resinous acids, which acids can be separated into three different acids or groups of acids according to their solubility in the different alkalies. The remaining resinous product is composed of ester resins. On hydrolysis these esters yield three distinct acids, two resinous acids and methysticinic acid. ”
