The present invention relates to novel pyrimidine derivatives and their use in perfume compositions. The novel pyrimidine derivatives of the present invention are represented by the following formula:wherein m and n are integers that when m is 0, n is 1； when m is 1, n is 0 or 1； or when m is 2, n is 0；wherein (CH)T" and (CH)n are each independently optionally substituted with a substituent selected from the group consisting of methyl and ethyl；wherein X is selected from the group consisting of N, 0, and S； andwherein R1 and Rz each independently represent H or a hydrocarbon group, or R1 and RZ together represent a fused ring or a ring system,with the proviso that when R1 is H, R2 is not H.
