The chemical compound whose formula (i) is large it offers this invention, with high yield and selectivity, in formula, R1 =H, C1-6 alkyl or C nH2n+1 basis, here n=1, 2 or 3, R2 =C1-4 alkyl, X=E- or Z-OH, and Y=O C1-6 alkyl, S C1-6 alkyl or OCH2 C nH2n+1, n=1, 2 or 3, the 4- general formula (i) (17- methyl - substitution 3- okisoesutora -4,9- diene -11- iru) benzaldehyde - (1E or 1Z) it regards the method of producing - oxime here. Conversion 1
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