[R-?(E,?E)?]?-[3-?Methyl-?5-?(2,?6,?6-?trimethyl-?2-?cyclohexen-?1-?yl)?-?2,?4-?pentadienyl]?triphenyl-phosphonium Bromide is an intermediate in synthesizing (6'R)-β,ε-Carotene (C184220). It is a trans isomer of carotenoid pigment found in plants. It is a terpenoid hydrocarbon.