The invention relates to substituted amino-thiourea compounds of formula (I), to the enantiomers, diastereomers and salts thereof and to compositions comprising such compounds. The invention also relates to the use of the substituted amino-thiourea compounds, of their salts or of compositions comprising them for combating animal pests. Furthermore the invention relates also to methods of applying such compounds. The substituted amino-thiourea compounds are defined by the following formula (I): wherein A, B, R1, R2, R3, R4, R5.1, R5.2 and R6 are defined as in the description.