[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]2[CH2:13][CH2:12][CH:11]([C:14]3[C:15](=[O:26])[C:16]4[C:21]([C:22](=[O:25])[C:23]=3Cl)=[CH:20][CH:19]=[CH:18][CH:17]=4)[CH2:10][CH2:9]2)=[CH:4][CH:3]=1.[OH-:27].[K+].Cl>CO.O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]2[CH2:9][CH2:10][CH:11]([C:14]3[C:15](=[O:26])[C:16]4[C:21]([C:22](=[O:25])[C:23]=3[OH:27])=[CH:20][CH:19]=[CH:18][CH:17]=4)[CH2:12][CH2:13]2)=[CH:6][CH:7]=1The product of stage (b) was suspended in 10 ml of boiling methanol and 0.55 g of potassium hydroxide in 5.5 ml of water was added dropwise over 15 mins. The mixture was refluxed until a dark red solution formed, (after ca. 6 hrs) when 2 ml of concentrated hydrochloric acid was cautiously added dropwise. The mixture was cooled and filtered, and the solid residue washed thoroughly with water. The water washings were re-acidified and filtered. The combined solid residues (500 mg) mp 200°-209°, were recrystallised from acetonitrile to give the title product as the trans-isomer (300 mg) m.p. 216°-219° C.
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