Figure 2.

2D ¹³C-¹H HMBC barcoding approach. The 2D NMR data of reference compounds were analyzed to generate a database of rectangular patterns (barcodes on the left) with four HMBC cross-peaks unique to each triterpene. Next, triterpene components in A. racemosa extract were identified by in silico matching of experimental NMR signals with the reference barcodes (bottom). Adapted with permission from [23]. Copyright 2014 American Chemical Society.