Abstract
The dimeric napthoquione 5,8,4′-trihydroxy-1′-methoxy-6, 6′-dimethyl-7,3′-binaphtyl-1,4,5′,8′-tetraone (1) was isolated from the chloroform fraction of Diospyros lotus extract. Compound 1 was screened for its inhibitory effects against four enzymes: urease, phosphodiesterase-I, carbonic anhydrase-II and α-chymotrypsin, and showed selective activity against urease enzyme with an IC
50
value of 254.1 ± 3.82 μM as compared to the standard thiourea (IC
50
= 21 ± 0.11 μM). Furthermore, in silico docking study was carried out to explain the molecular mechanism of compound 1 against the target receptor.