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The title compound, C 26 H 38 O 6 ·H 2 O, is a mono-ester of a derivative of maleopimaric acid, an abietic-type acid. The two fused and unbridged cyclo­hexane rings adopt approximate chair conformations while the three other three six-membered rings have boat conformations.

13-Ethoxycarbonyl-16-(1-methylethyl)-17,19-dinoratis-15-ene-4,14-dicarboxylic acid monohydrate: a new derivative of maleopimaric acid