Abstract The plant growth-regulating activity on tomato plants of S-carboxymethyl-N, N- dimethyldithiocarbamate and of structurally related compounds has been investigated. Activity is connected with the electronic configuration of the molecules, viz. with a distinct degree of double-bond character of the N [BOND] C bond. In addition, however, sterical factors seem to be of decisive significance for presence or absence of growth-regulating ...