Compounds derived from strigolactams, processes and intermediates to prepare them, and plant growth regulating compositions that comprise them, and their methods of use to control plant growth and / or enhance seed germination. Claim 1: A compound of formula (1) wherein W is O or S； R² and R³ are independently hydrogen or C₁₋₃ alkyl；R83088 and r83099 are independent matrices of hydrogen, halogen, nitrogen, cyanogen and c832131；Halogenated tar c83218323；C₁₋₃ alkoxy,Hydroxy, - OC (o) r8313,amina N- (alquil C) amina o N N-di (alquil C) amina R es hidr geno alquilo CC₁₋₆ alkoxy or C₁₋₆ haloalkyl；R8310a and r8311a are independent hydrogen, c8332131 coking；a. Hydroxy, halogen or alcoxi c832131；R⁸ is hydrogen, nitro, cyano, C₁₋₆ alkyl,C₁₋₆ haloalkyl,Halogen, asphalt c8331821；haloalkylthio C₁₋₈,a. Sulfur, N - (tar c8332121； 8326；hydroxyl, amine, N- (C₁₋₆ alkyl) amine, N, N-di (C₁₋₆ alkyl) amine, C₁₋₆ alkyl optionally substituted with one to five R¹⁰,a. Carbonate (Alcoy c83218c83316c83316c833288a1) 1 to 5 r83044, optionally replaced by arilo；Alternative heterosexuals were replaced by 1 to 5 r83044；1. 1-5 r83044 or 1-5 r83044 were selected to replace non cyclohexane；R¹⁰ is hydrogen, cyano, nitro, halogen, C₁₋₆ alkyl,C₁₋₆ alkoxy,C₁₋₆ haloalkyl,a. Alquenilo c832283316a or c832283316a；A1,...A3 and a83088 are C-X, c-y or nitrogen respectively, each X or Y may be the same or different, and there are no more than two in group A1,...A3 and a83088 are nitrogen and have at least one A1 group,...A3 and a8308sea C-X； hydrogen, halogen, cyanogen, hydroxy OC (o) r8313；C₁₋₆ alkoxy,1. Lease land No. c833218331 and 832626；C₁₋₆ haloalkyl,Hydroxyl oxidation c83217c83183223；nitro amina N- (alquil C) amina N N-di (alquil C) amina o NHC (O) RX is C₂₋₈ alkenyl optionally substituted with one to five R¹¹,C₂₋₈ alkynyl optionally substituted with one to five R¹¹,C₃₋₇ cycloalkyl,C₃₋₁₀ cycloalkyl substituted with one to five R¹²,(C₁₋₈ alkyl) carbonyl, (C₁₋₈ alkoxy) carbonyl, N- (C₁₋₆ alkyl) aminocarbon
