A compound of general formula (I) wherein R 1 , R 2 , R 3 , and R 4 are, independently, a hydrogen atom or an optionally substituted linear or branched C 1 -C 6 alkyl or C 2 -C 6 alkenyl group, provided that when each of R 1 , R 2 , and R 3 are a hydrogen atom, R 4 is not a phenyl substituted linear or branched C 1 -C 6 alkyl or C 2 -C 6 alkenyl group； and with the proviso that the compound of formula (I) is neither 6,6,6a-trimethyl-hexahydro-cyclopenta[b]furan, 6,6,6a-trimethyl-2-ethyl-hexahydro-cyclopenta[b]furan, nor 6,6,6a-trimethyl-2-propyl-hexahydro-cyclopenta[b]furan and use thereof in a fragrant and/or flavouring composition.
