(+)-(8S,10R)-9-aza-10-methyl-8-n-pentadecyl-1,5-dioxaspiro[5.5]undecane

(+)-(7S,9R)-8-aza-9-methyl-7-n-tridecyl-1,4-dithiaspiro[5.4]decane

(7R,9R)-7-ethoxycarbonyl-9-methyl-1,4-dithia-8-azaspiro[5.4]decane

(+)-(8S,10R)-9-aza-10-methyl-8-n-undecyl-1,5-dioxaspiro[5.5]undecane

(+)-(7R,9R)-8-aza-9-methyl-7-prop-1'-enyl-1,4-dithiaspiro[5.4]decane