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2-(Pyridin-4-yl)ethanesulfonic acid: BD6261853054-76-598%; ￥696.025g

2-(Methylamino)ethanesulfonic acid: BD145204107-68-695%; ￥39.01g

Ethanesulfonic acid: BD127603594-45-697% (contains ~5%H2O); ￥78.025g

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