Vitamin K structures (K1, MK-4, MK-7)
Vectorization of <a class="external free" href="https://commons.wikimedia.org/wiki/File:Vitamin_K_structures.jpg">https://commons.wikimedia.org/wiki/File:Vitamin_K_structures.jpg</a>
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<span class="int-own-work" lang="en">Own work</span>