There's a minor mistake in the chemical structures of this graphic in the version checked in June 2014. After the 2nd reaction, labelled AH2 / perox, the carboxyl group of PGG2 should be reduced to a hydroxyl group. PGH2, top right, should have an OH instead of an OOH at functional group on the lower alkyl. Compare http://vanderdonk.scs.uiuc.edu/van_der_Donk/prostaglandins.html archive copy at the Wayback Machine

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