Stock Photo: Viagra. Molecular model of the drug sildenafil citrate, marketed under the brands Viagra and Revatio. Atoms are represented as spheres and are colour_coded: carbon grey, hydrogen white, nitrogen blue, oxygen red, sulphur yellow.

Viagra. Molecular model of the drug sildenafil citrate, marketed under the brands Viagra and Revatio. Atoms are represented as spheres and are colour_coded: carbon grey, hydrogen white, nitrogen blue, oxygen red, sulphur yellow. : Stock Photo

4128R-13855 | Royalty Free
Credit: Science Photo Library / Science Photo Library
Category: Science
SPH-F003-4920

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