Patent ID: 8618162

Claim:
A compound of Formula (II): wherein: A is chosen from O and S; R 21 is chosen from methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, isobutyl, â€”CF 3 , â€”CF 2 CF 3 , â•CH 2 , â•CHCH 3 , â•CHCH 2 CH 3 , â•C(CH 3 ) 2 , â•CHCH 2 CH 2 CH 3 , and â•C(CH 3 )(CH 2 CH 3 ); R 22 is chosen from ethyl, propyl, butyl, â€”CF 3 , and â€”CF 2 CF 3 ; and R 23 is hydrogen or when appropriate is no substituent.