Composition #1: Frick, S., Kramell, R., Schmidt, K., Fist, AJ., Kutchan, TM. Comparative qualitative and quantitative determination of alkaloids in narcotic and condiment Papaver somniferum cultivars . journal of natural products, 2005, vol. 68, no. 5, p. 666–673. DOI: 10.1021/np0496643.
[
DOI link]