Download full text in 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. ... A photochemical aromatic annulation strategy provides efficient synthetic routes to the diterpenoid quinones (+)-danshexinkun A, danshexinkun B, danshexinkun C, (−)-dihydrotanshinone I, and tanshinone I. ... Efficient total syntheses of (+)-danshexinkun A, (−)-dihydrotanshinone I, ...