putrescine + spermidine = sym-homospermidine + propane-1,3-diamine
putrescine + spermidine = sym-homospermidine + propane-1,3-diamine
putrescine + spermidine = sym-homospermidine + propane-1,3-diamine
putrescine + spermidine = sym-homospermidine + propane-1,3-diamine