2,2-DIMETHYL-PROPIONIC ACID (6AR,10AR)-1-(TERT-BUTYL-DIMETHYL-SILANYLOXY)-3-(1,1-DIMETHYL-HEPTYL)-6,6-DIMETHYL-6A,7,10,10A-TETRAHYDRO-6H-BENZO[C]CHROMEN-9-YLMETHYL ESTER