Patent ID: 7550451

Claim:
A compound of formula I wherein R 1 , R 2 , R 3 , R 4 and R 5 as well as R 15 and R 16 have the following meaning: R 1 is a hydrogen atom, an alkanoyl radical with 1 to 10 carbon atoms or an optionally substituted benzoyl radical with 6-10 carbon atoms or a radical CONHR 5 , wherein R 5 is a hydrogen atom, an alkyl or acyl radical which comprises 1-10 carbon atoms in each case or an alkylaryl or aralkyl radical which comprises 6-10 carbon atoms in each case, R 2 is a halogen atom or a CF 3 group, R 3 is a hydrogen atom or a group CH 2 X, wherein X is a hydrogen atom, a hydroxy group, a halogen atom, an alkyl radical with 1 or 2 carbon atoms, or X is a radical (CH 2 ) n CH 2 Y wherein n=0 or 1, and Y is a halogen atom, wherein if R 2 is a halogen atom, R 3 optionally is additionally a group C n F m H o , wherein n=1, 2, 3, 4 or 5, m>1 and m+o=2n+1, R 4 is a hydrogen atom, an alkyl or alkanoyl radical that consists of 1-10 carbon atoms in each case or a benzoyl radical which comprises 6-10 carbon atoms or a radical —CONHR 5 , wherein R 5 has the above-indicated meaning, and R 15 and R 16 are each, independently of one another, hydrogen or together a double bond.