The diamidine derivative containing the indole ring has the structure of formula I, wherein R1, R2 and R' are independently selected from hydrogen, a C1-12 linear chain alkyl, C3-12 branch chain alkyl and C3-12 cycloalkyl; or R1, R2 and R' are independently selected from a C3-12 linear chain alkyl, C3-12 branch chain alkyl and C3-12 cycloalkyl with carbon chains containing heteroatoms; or two of R1, R2, R' and Ns connected to them form 3-6-membered rings or 3-6-membered rings with substituent groups; X, Y, V, W and X', Y', V', W' are independently selected from C or N, and fulfilling a six-membered ring structure having X, Y, V, W and X', Y', V', W'; and A and A' are independently selected from hydrogen, halogen, a low-level alkoxy or low-level halogenated alkyl which are connected to the six-membered rings.
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