全部 Thiol-PEGn-alcohol Thiol-PEGn-acid Thiol-PEGn-t-butyl ester Thiol-PEGn-phosphonic acidThio Thiol-PEGn-N3 Thiol-PEGn-NH2 t-Boc-N-amido-PEGn-thiol M-PEGn-SH Lipoamido-PEGn-alcohol Lipoamido-PEGn-acid Lipoamido-PEGn-azide Lipoamide-PEGn-Mal