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Microreactions performed on M. hirsutus natural pheromone extracts and possible 2 + 2 retro-cleavage of compound 2 according to EI MS data (relative intensities in parentheses). a, 2 M NaOH in 95% EtOH; b, H2/Pd-C in EtOAc; c, N,O-bis(trimethysily)trifluoroacetamide.
