(3r,6r)-6-tert-butyl-1-oxaspiro[2.5]octane 1-oxaspiro[2.5]octane, 6-(1,1-dimethylethyl)- InChI=1/C11H20O/c1-10(2,3)9-4-6-11(7-5-9)8-12-11/h9H,4-8H2,1-3H3/t9-,11