alpha,alpha'-(iminobis(methylene))bis(3,4-dihydro-2H-1-benzopyran-2-methanol), (2R-(2R*(S*(S*(R*)))))-isomer
alpha,alpha'-(iminobis(methylene))bis(3,4-dihydro-2h-1-benzopyran-2-methanol), (2r-(2r*(s*(s*(r*)))))-isomer