Photoresist manufacturer

Hi friends,

I need to identify the e beam resist and developer on a sample.

Does anyone know whether ZEP-520A is only manufactured by ZEON? Or in general, is any e beam resist type (e.g. PMMA, ZEP520) the product of one company?
And, is there somewhere a list of materials used as ebeam resist, and a list of the corresponding developers?

Many thanks,

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