N-[10-(13,14-Methylenedioxyphenyl)-7(E),9(Z)-pentadienoyl]-pyrrolidine

A further minor alkaloid found in Piper nigrum, this base may be recrystallized from Et20 when it yields long, slender needles. The ultraviolet spectrum has absorption maxima at 245,261,309 and 343 mil. The configuration about both of the double bonds in the side chain is trans. The structure given above has been confirmed by synthesis.