2-CH2 benzofuron protons were signalled as triplets at 4.61–4.65
and 2.35–2.30 cm−1. 13C NMR studies revealed that all the respective
aromatic carbons appeared at C4 (127.93), C5 (120.33), C6
(126.91), C7 (did not appear), C8 (127.3) and the benzofuron 2-CH2
carbons were signalled at C2 (70.99), C3 (29.74). Thus, from the
spectral studies the isolated bio-active molecule was confirmed as
Coumaran (Fig. 2) (detailed characterization is given below)