| abstract |
Provided are compounds of formula (I) wherein m is 0, 1 or 2; R 1 is a mono- or bicyclic heterocyclic ring system comprising one, two or three heteroatoms selected from nitrogen, sulphur and oxygen; R 2 is selected from hydrogen, methyl and ethyl; I) R 3 is hydrogen, methyl, or ethyl; and R 4 and R 5 are independently selected from ethyl and isopropyl; and R 3 , R 4 and R 5 together comprise at least 6 carbon atoms; or II) any two or ail of R 3 , R 4 and R 5 form together with the carbon atom to which they are attached 3-para-menthyl, bornyl, or adamantly; having cooling properties, their use as cooling agent and compositions comprising them. |