Patent ID: 7592487

Claim:
A compound of the formula wherein R 1 is optionally substituted lower alkyl or aralkyl; R 2 is optionally substituted lower alkyl; R 3 and R 4 are independently hydrogen, halo, lower alkyl, alkoxy or trifluoromethyl; or R 3 and R 4 combined together with the carbon atoms to which they are attached form an optionally substituted fused 6-membered aromatic ring provided that R 3 and R 4 are attached to carbon atoms adjacent to each other; R 5 is hydrogen, lower alkyl, lower alkoxy or halo; R 6 and R 7 are hydrogen; or R 6 and R 7 combined together with the carbon atoms to which they are attached form a fused 6-membered aromatic ring; provided that (i) R 3 , R 4 , R 5 , R 6 and R 7 are not hydrogen when R 1 is methyl, ethyl, pentyl, allyl, 3-buten-1-yl, benzyl or phenethyl and R 2 is methyl; or (ii) R 3 , R 4 , R 6 and R 7 are not hydrogen when R 1 and R 2 are methyl and R 5 is methyl located at the 4-position; or an enantiomer thereof; or an enantiomeric mixture thereof.