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