This invention describes novel DNA sequences which function as promoters of anther-specific transcription of coding DNA sequences in recombinant or chimeric DNA sequences. In particular, the method is useful for the preparation of 2-methoxy-5,6-difluorobenzaldehyde, an important intermediate for the preparation of 4-amino-2-pyrimidin-5-ylmethanone, a potent and selective inhibitor of CDK4Cyclin D1, CDK2Cyclin E and CDK1Cyclin B. By effecting vulcanization, a vulcanized elastomeric compound is produced containing good physical properties for use as tread stock for a pneumatic tire.