RB-PEG-SH (MW 4600) (Rhodamine B-PEG-SH (MW 600)) is a fluorescent dye composed of Rhodamine B, PEG, and a thiol group (SH). The SH group exhibits high reactivity, enabling it to form stable thioether bonds with various functional groups, such as maleimide (Ex/Em = 546/610 nm).
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