(εR,1R,3aR,4S,7aR)-Octahydro-4-hydroxy-α,α,ε,7a-tetramethyl-1H-indene-1-pentanol-d6 is an intermediate in synthesizing Calcitriol-d6 (C144502), the biologically active form of vitamin D3. Calcium regulator; vitamin (antirachitic); antihyperparathyroid; antineoplastic; antipsoriatic. (εR,1R,3aR,4S,7aR)-Octahydro-4-hydroxy-α,α,ε,7a-tetramethyl-1H-indene-1-pentanol-d6 is also a labelled analogue of (εR,1R,3aR,4S,7aR)-Octahydro-4-hydroxy-α,α,ε,7a-tetramethyl-1H-indene-1-pentanol (O236455).