The present invention concerns a composition of matter comprising i) from 35 to 55% w/w of (R,Z)-3-methyl-cyclopentadec-5-en-1-one, having an ee of at least 80%； ii) from 27 to 40% of (R,E)-3-methyl-cyclopentadec-5-en-1-one, having an ee of at least 80%； iii) from 3 to 20% of (S,E)-3-methyl-cyclopentadec-4-en-1-one, having an ee of at least 80%； and iv) from 0 to 5% of (S,Z)-3-methyl-cyclopentadec-4-en-1-one, having an ee of at least 80%； as well as the use as perfuming ingredient of said composition of matter.
