Add new monomer in the library

[ljubica-milovic]

• [x] 4-Arm PEG-Maleimide Location in the library: CHEM Name in the library: 4-Arm PEG-Maleimide Abbreviation in the library: 4aPEGMal Attachment points/leaving groups: R1=H, R2=H, R3=H, R4=H Structure: 4-Arm PEG-Maleimide .zip

[AlexeyGirin]

Verified.

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