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. Author manuscript; available in PMC: 2013 Feb 13.
Published in final edited form as: Biomacromolecules. 2011 Dec 29;13(2):323–331. doi: 10.1021/bm2013058

Figure 4.

Figure 4

A portion of the MALDI-TOF spectrum of the final product from the procedure indicated in Figure 3. M refers to poly(CO) containing eight subunits with an acetyl N-terminus and an imide C-terminus. M+A refers to this octamer plus the unit indicated as A in Figure 3; presumably this species has been formed by attack of the β-lactamate formed from A on the C-terminal imide of M. The pair of signals near 1400 MW are unit A plus a poly(CO) heptamer with an acetyl N-terminus and an imide C-terminus. Additional MALDI-TOF data may be found in the Supporting Information.