It is found out that compounds represented by the formula (I):
1
wherein R
1
is an optionally substituted carbocyclic group or an optionally substituted heterocyclic group; and R
2
and R
3
taken together with the adjacent carbon atom form an optionally substituted heterocyclic group having one or more of oxo and/or thioxo; have an HCV RNA-dependent RNA synthase inhibitory effect.
The present invention relates to novel compositions, comprising a repellent and an additive, where the additive is selected from the group consisting of phenol, benzaldehyde, benzoic acid or derivatives thereof and is present in a ratio of from 10:100 to 200:100% by weight to the repellent, and to their use for repelling crawling harmful insects, in particular ants or cockroaches.