The present refers to mimetic derivatives of non-steroidal brassinosteroids of formula (1) as defined herein, to processes and intermediates for preparing them, to plant growth regulating compositions that compose them and to their methods of use to control plant growth and or enhance seed germination. Claim 1: A compound according to formula (1) where: Y is O or S； R¹⁰ is H, halogen, C₁₋₆ alkyl,C₁₋₆ alkoxy,C₁₋₆ haloalkyl or cyano； X is halogen, haloalkyl C₁₋₆,ciano tiocianato nitro alcoxi Chaloalkoxy C₁₋₆,1. C8332121 asphalt；Halogenated tar c83217c831832626；C₁₋₆ alkylsulfinyl,Cal haloalkylsulfinyl,C₁₋₆ alkylsulfonyl,1. Halogen glycol c83216c83183226；C₂₋₆ alkenyl,1. C 83228331 asphalt；amine, N- (C₁₋₆-alkyl) amine, NN-di (C₁₋₆-alkyl) amine, (C₁₋₆-alkyl) carbonyl, (C₁₋₆-alkoxy) carbonyl, (C halo-haloalkoxy) carbonyl, (C₁-haloalkyl) ₋₆) carbonyl, C ciclo cycloalkyl,formyl or mercapto； or X is heteroaryl or heteroaryl substituted with one or more of the following groups: halogen, cyano, C₁₋₃-alkyl,a. Halogenated tar c83218d318323；R¹ is H, C₁₋₆ alkyl,haloalkyl C₁₋₆,(C₁₋₆-alkyl) carbonyl, (C₁₋₆-alkoxy) carbonyl； or R¹ is C₁₋₆ alkyl substituted with one or more of the following groups: cyano, amine, carbonylamine； R² is a group according to formula (2)；O r 1 and R 2 form a cycle group around nitrogen according to the formula (3)；Each W is independent or s； a is - or8311n； u-nhcn； R * 3,R830808,R83099 and r8310s are independent hydrogen, halogen, nitrogen, cyanogen and c832131 asphalt；Halogenated tar c83218323；C₁₋₃ alkoxy,Hydroxy, - OC (o) r831222,amine, N- (C₁₋₃-alkyl) amine or N, N-di (C₁₋₃-alkyl) amine； where R⁸ is hydrogen, C₁₋₆ alkyl,C₁₋₆ alkoxy or C₁₋₆ haloalkyl；R8311811 is hydrogen, c8332131 hydrocarbon 832626,haloalkyl C₁₋₆,C₂₋₆ alkenyl,haloalkenyl C₂₋₆,1. C 83228331 asphalt；haloalkynyl C₂₋₆,cycloalkyl C₃₋₇,a. Arilo or arilo is replaced by one to five alternatives to r8313；1. Replace non bicycle or non bicycle with 1 to 5 r8313 substitutes；or R⁷ is C₁₋₆ alkyl substi
