Kupchan et al. Journal of the American Chemical Society, 1953 , vol. 75, p. 5519,5524 Full Text Show Details Stoll; Seebeck Helvetica Chimica Acta, 1953 , vol. 36, p. 189,196 Full Text Show Details Pelletier; Jacobs Journal of the American Chemical Society, 1953 , vol. 75, p. 3248,3251