abstract |
The present invention is a compound of formula (IIa) having a reactive functional group M, which reacts with a biopolymer BP having at least one group capable of reacting with M so as to form a covalent bond. Provides a compound capable of providing a biopolymer derivative of formula (IIIa). The biopolymer derivatives of the present invention have a high ionization capacity for free 10 biopolymer BP , allowing improved biopolymer analysis using mass spectrometry. The present invention further provides specific examples of compounds of formula (IIa), for example, compounds of formula (IIa-2a) and formula (IIa-58a). |