https://axispharm.com/product-category/polymer-peg/hydrazide/4-arm-peg-hydrazide/
4-Arm PEG-Hydrazide | 4-arm PEG-HZ | AxisPharm
4-Arm PEG-Hydrazide (4-arm PEG-HZ) is a multi-armed PEG derivative with hydrazides (CONHNH2) at each end, which can react with ketones or aldehydes to form...
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https://creativepegworks.com/product/hyaluronate-hydrazide-mw-750k-100mg
Hyaluronate Hydrazide, MW 750k - Creative PEGWorks | PEG Products Leader
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