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  • Title: Identification of a novel vardenafil analogue in herbal product.
    Author: Lam YH, Poon WT, Lai CK, Chan AY, Mak TW.
    Journal: J Pharm Biomed Anal; 2008 Mar 13; 46(4):804-7. PubMed ID: 18248930.
    Abstract:
    A new herbal health product marketed for enhancing erectile function, namely Power58 Platinum, was purchased over-the-counter in Hong Kong. The product was tested for adulteration with sildenafil, tadalafil, and vardenafil as well as their structurally modified analogues. A new analogue of vardenafil, in which the N-ethylpiperazine ring and the sulphonyl group were removed from the vardenafil structure, was identified in the product.
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