(2S)-3,3'aβ,6',6',9'aβ-Pentamethyl-3'a,4',5',5'aα,6',7',8',9',9'a,9'bα-decahydrospiro[furan-2(5H),2'(1'H)-naphtho[2,1-b]furan]-5-one

(2S,3a'R,5a'S,9a'S,9b'R)-3a',6',6',9a'-Tetramethyl-3-(methyl-d3)-3a',4',5',5a',6',7',8',9',9a',9b'-decahydro-1'H,5H-spiro[furan-2,2'-naphtho[2,1-b]furan]-5-one is a deuterium labelled (2S,3a'R,5a'S,9a'S,9b'R)-3,3a',6',6',9a'-Pentamethyl-3a',4',5',5a',6',7',8',9',9a',9b'-decahydro-1'H,5H-spiro[furan-2,2'-naphtho[2,1-b]furan]-5-one, which is a useful research chemical used in the catalytic carbonylative spirolactonization of hydroxycyclopropanols in the synthesis of α-levantanolide and α-levantenolide.