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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.
Stock Photo: 4128R-13855 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.

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

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