poly[(U4)Z?GlcN3]; see insert in spectrum Koch-Light Ltd., Colnbrook, Bucks., UK suspension in methanol; 10 yg standard 2 X 105

REMARKS - Compare with Spectrum A.12. The intense peak at m/z 60 may point to the presence of acetate counter ions at the amine groups. Note the sulphur-containing ion signals at m/z 34 (H2S+*), 48 (CH3SH+- and/or S0+'} and 64 (SO?4"" and/or S2+" and/or CH3S0H+") indicating the presence of noncarbohydrate contaminants.

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