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(9E)-12-Hydroxy-9-octadecenoic Acid, is an unsaturated omega-9 trans fatty acid.

ChEBI: Ricinelaidic acid is a straight-chain, 18:1, long-chain fatty acid having a trans- double bond at position 9 and an R-oriented hydroxy group at position 12. It is a long-chain fatty acid, a straight-chain fatty acid and a hydroxy monounsaturated fatty acid. It is functionally related to an elaidic acid.