Helichrysum refluxum

In addition to the /-abietane skeleton, other tricyclic e /-pimarane derived ring skeletons have been reported (Figure 15) Cleistanthanes and isocleistan-thanes were detected in Brickellia eupatoriedes (JP) and erythroxanes were identified in Helichrysum refluxum (450). The absolute configuration (5R, lOR) of the Brickellia cleistanthanes is identical to that reported for the cleistanthanes of the Euphorbiaceae, but antipodal to those (5S, lOS) of the Velloziaceae (Vellozia) (Figure 16 [p. 428] 427). 

Bohlmann, F., L. Hartono, and J. Jakupovic A diterpene related to erythroxydiol from Helichrysum refluxum. Phytochem. 24, 611 (1985). 

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