THE skeleton indicated is (I) and we first attempted an extension of the method whereby (II) had been synthesized in 1937 1. However, cyclization of 1-formamido-6: 7-dimethoxy-2-(2â-bromo-4â ...
of the constitution of chelerythrine by Karrer, of chelidonine by Gadamer, and so on, to realise the immense amount of material that Dr. Henry had to examine critically and sift in the preparation ...