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The present work describes two radiosynthetic pathways to prepare homocysteine[ 75 Se]selenolactone  1  starting from n.c.a. [ 75 Se]selenite  2 . It was achieved either by alkylation reaction of n.c.a. methyl[ 75 Se]selenide  4  or by hydrolysis of alkylated 1,3-dicyclohexyl[ 75 Se]selenourea  11 .

Alternative syntheses of [ 73,75 Se]selenoethers exemplified for homocysteine[ 73,75 Se]selenolactone