Natural Products (NP) are essential for the discovery of novel drugs and products for
numerous biotechnological applications. The NP discovery process is expensive and time …

The calculations of NMR properties of molecules using quantum chemical methods have
deeply impacted several branches of organic chemistry. They are particularly important in …

Covering: 2013 up to the end of 2015 This review covers the isolation and structure of new
pyrrolizidines; pyrrolizidine biosynthesis; biological activity, including the occurrence of …

In the early 2000s, the first articles regarding the calculation of NMR parameters for natural
products appeared in the literature. Since then, modelling 1H and 13C chemical shifts and …

Naturally occurring pyrrolizidine alkaloids (PAs) are isolated from plants and other sources.
The interest of the scientific community in these compounds owes itself to their high toxicity …

Covering: 2019 to 2023. Even with the advent of modern and complementary spectroscopy
techniques, comprehensive characterization of natural product continues to represent an …

Previous studies have shown that pollen products sold as nutritional supplements and used
in apitherapy may contain toxic pyrrolizidine alkaloids (PAs) if bees collect pollen from PA …

Various studies have shown that bee-collected pollen sold as nutritional supplements may
contain toxic pyrrolizidine alkaloids (PAs) and, thus, pose a potential health risk for …

A dimeric indole alkaloid, isovincathicine consisting of an aspidosperma type and modified
iboga with C-7–C-20 connection type skeletons was first isolated from Catharanthus roseus …

A new dimeric indole alkaloid, vincazalidine A consisting of an aspidosperma type and a
modified iboga type with 1-azatricyclo ring system consisting of one azepane and two …