A recent reinvestigation of aerial parts of Wedelia paludosa D.C. is described and reports, for the first time, the isolation of iso-kaurenoic acid from this species.

A reinvestigation of a chiral phosphoric-acid-catalyzed four-component Hantzsch enantioselective synthesis polyhydroquinolines reported in 2009 is presented. In our hands, when the reaction was performed with fidelity to original report using enantiopure phosphoric acid catalyst, no enantioselectivity observed. Unlike report, results are backed by baseline separation enantiomers HPLC analyses o...

A reinvestigation of the proton resonance spectrum of vindolinine based on new data at 300 MHz is now completely consistent with the recently modified structure. These data are presented as an example of possible pitfalls in the interpretation of complex spectral data for structural analysis. Spectra and assignments are included.

Reinvestigation of the extract of the ascidian Didemnum granulatum collected on the Brazilian coastline led to the isolation of two minor compounds, granulatimide (2) and 6-bromogranulatimide (3), which have been identified by analysis of their spectroscopic data. The isolation of 2 and 3 from D. granulatum corroborates previous assumptions about the occurrence of granulatimide as a natural pro...