Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... (±)-Megistophylline I (1), carrying a dienone residue in the acridone framework, was synthesized using the Claisen rearrangement to introduce a prenyl group as a key step. ... Megistophylline I (1), isolated from the bark of Sarcomelicope megistophylla Hartley (Rutaceae) by Papageorgiou et al., 1 ...