Chemistry and crystal structure of some constituents of Zingiber cassumunar - Amatayakul,T.; Cannon,J.R.; Dampawan,P.; Dechatiwongse,T.; Giles,R.GF.; Huntrakul,C.; Kusamran,K.; Mokkhasamit,M.; Raston,C.L.; Reutrakul,V.; White,A.H. (Austr J Chem, 1979)