What are the main uses of Ethanesulfonic acid - methyl (3Z)-3-{[(4-{methyl[(4-methyl-1-piperazinyl)acetyl]amino}phenyl)amino](phenyl)methylene}-2-oxo-6-indolinecarboxylate (1:1) (CAS: 656247-18-6)?

Ethanesulfonic acid - methyl (3Z)-3-{[(4-{methyl[(4-methyl-1-piperazinyl)acetyl]amino}phenyl)amino](phenyl)methylene}-2-oxo-6-indolinecarboxylate (1:1) is primarily used in pharmaceutical research as an intermediate for developing drugs. Its structure includes a sulfonic acid moiety and a complex indoline framework, which may be useful in the synthesis of bioactive molecules. It is also used in chemical synthesis to create derivatives with potential therapeutic applications. The compound is relevant in the fields of medicinal chemistry and drug discovery.