[Studies on the chemical constituents of Rhododendron molle G. Don]

Two physiologically active diterpenoids were isolated from the flower of Chinese azalea (Ericaceae Rhododendron molle G. Don). One of them is a new compound, named rhodomollein-III; its structure has been established as 1 through IR, MS, 1HNMR, 13C NMR, 1H-1H COSY, 1H-1H NOESY, 13C-1H COSY and long-range 13C-1HCOSY. The other one is the known rhodojaponin-III.