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Thermospermine Tetrahydrochloride is a structure isomer of Spermine (S680510); a biogenic polyamine formed from spermidine and occurring in almost all tissues. Thermospermine is a novel type of plant growth regulator and may also serve in the control of wood biomass production.

ChEBI: Propane-1,3-diamine in which a hydrogen attached to one nitrogen is substituted by a 3-aminoprop-1-yl group, and a hydrogen attached to the other nitrogen is substituted by a 4-aminobut-1-yl group. A polyamine natural product, its name arises from its simi arity to spermine and the fact that it was first isolated from the extreme thermophile, Thermus thermophilus.