Plasticine is a synthetic hormone conduction inhibitor and a derivative of 9- hydroxy -9- carboxylic acid fluorene. Alkyl esters of plastics are commonly used. Among them, n-butyl integer (EMD-IT3233) and 2- chloroplastic methyl ester (EMD-IT3456) have stronger activity, while 2,7-dichloroplastic methyl ester (EMD-IT5733) has less activity. Plasticine is insoluble in water, but soluble in ethanol. It is sensitive to ultraviolet photolysis, especially its free acids and amide salts, which are unstable when heated. Non-toxic, the final decomposition product is carbon dioxide, which has no pollution to the environment and is not a long-term inhibitor.

The mechanism of plasticine is to inhibit the synthesis of endogenous auxin and gibberellin in plants, as well as the polar conduction and lateral transport of auxin. The inhibitory effect on auxin is greater than gibberellin, and it can also inhibit the mitosis of meristem cells, promote the dwarfing of stems, and cause abnormalities in morphology and organs. This inhibitory injury can be recovered. At the same time, it can change the geotropism, phototropism and apical advantage of plants.