Strychnine and brucine exist in combination with igasuric acid discovered by Ludwig in 1873. The proportion of both the alkaloids is greater than in the seeds of nux vomica which contain only .
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
It gives a red colour with brucine, turns the green sulphate of iron black, and with hydrochloric acid dissolves gold.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson
From these strychnine and brucine are obtained.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson