In addition to the previously reported brombyin-I and brombyin-II, four further novel brombyin type derivatives have been obtained from the stem bark of Brombya platynema. These were identified as (rel)-3β-piperonyl-4β-acetyl-3,4,4aβ,5,6,7,8,8aa-octahydronaphthal-l-ene (brombyin-III), (rel)-3-piperonyl-4β-acetyl-l,4,4aβ,5,6,7,8,8aαoctahydronaphthal-2-en-l-one (brombyin-IV), l-piperonyldodecan-9-01-11 one (brombyin-V) and (rel)-3β-piperonyl-4β-acetyl-2,3,4,4aβ,5,6,7,8-octahydronaphthalen-l(8aβen-2β-ol (brombyin-VI). Also present were the simple cinnamic acid derivatives (E)-piperonylprop-2-enal and (E)-piperonylprop-2-enoic acid. A possible route for the formation of the brombyins is discussed.