Psoralidin (1) was first isolated from seeds of Psoralea corylifolia Linn. It was found to be an active ingredient of many Indian and Chinese traditional herbal medicines. Psoralidin exhibits a variety of biological activities like antineoplastic, antioxidant, antibacterial, antidepressant activities. Psoralidin inhibits protein tyrosine phosphatase 1B activity. Psoralidin may act as a estrogen receptor agonist. In addition psoralidin showed potent and noncompetitive inhibition against UDP- glucuronosyltransferase (UGT) or cytochrome p450 (CYP450) enzymes.

Tunicamycin VII is nucleotide sugar analogs produced by several Streptomyces species. In eukaryotes, Tunicamycin VII inhibit UDP-N-acetylglucosamine-dolichol phosphate GlcNAc-1-P transferase (GPT) that catalyzes the first step in protein glycosylation. In bacteria they inhibit UDP-N-acetylmuramoyl-pentapeptide: undecaprenol phosphate MurNAc-pentapeptide-1-P transtransferase (MraY) that catalyzes an early stage in peptidoglycan cell wall assembly. Tunicamycins are substrate analog of GPT and MraY, such that the alphabeta-1'',11'-linked GlcNAc residue of the tunicamycins mimics the transferred GlcNAc-1-phosphate. Tunicamycin VII impairs ALK phosphorylation and disrupts pro-survival signaling and cell viability in various neuroblastoma cell lines. A few studies suggest that tunicamycin may work as a therapeutic drug to cancer cells as it has been shown to sensitize human colon and prostate cancer cells to TRAIL-induced apoptosis.