BHMT inhibitors. The inhibitors were designed to mimic the hypothetical transitionstate of BHMT substrates and consisted of analogues with NH, N(CH3), or N(CH3)2 groups separated from the homocysteine sulfur atom by a methylene, ethylene, or a propylene spacer. Only the inhibitor with the N(CH3) moiety and ethylene spacer gave moderate inhibition. This result led us to prepare two inhibitors lacking