Dimerum acid is a dihydroxamate (dihydroxamate) type iron carrier (siderophore) found in Penicillium chrysogenum. It serves as a precursor or degradation product of coprogen and significantly enhances iron uptake in Strategy I plants (such as cucumber) and Strategy II plants (such as maize). At a pH of 6.0, dimerum acid releases bioavailable Fe3+ through ligand exchange with plant-secreted phytosiderophore (phytosiderophore, PS) or EDTA, thereby improving iron supply efficiency in plants. Dimerum acid is applicable in research related to plant iron nutrition and agriculture.