Oxaloacetic acid, oxalacetic acid, OAA, oxaloacetate molecule. It is oxodicarboxylic acid, metabolic intermediate. Skeletal chemical formula stock illustration...

Frequently asked questions

What's a royalty-free license?

Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that content. It's a win-win, and it's why everything on iStock is only available royalty-free — including all Atom images and footage.

What kinds of royalty-free files are available on iStock?

Royalty-free licenses are the best option for anyone who needs to use stock images commercially, which is why every file on iStock — whether it’s a photo, illustration or video clip — is only available royalty-free.

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Learn more about royalty-free images or view FAQs related to stock illustrations and vectors.