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Fourth generation PPI dendrimers , sialic acid conjugated PPI dendrimers ( SPPI ) , mannose conjugated PPI dendrimers ( MPPI ) and dual ligand system i . e . sialic acid conjugated - mannosylated PPI dendrimers ( SMPPI ) were synthesized and characterized by FT - IR and ( 1 ) H NMR spectroscopies and were further confirmed by size exclusion chromatography and differential scanning calorimetry .
 Chemical: PPI; Chemical: sialic acid; Chemical: PPI; Chemical: mannose; Chemical: PPI; Chemical: sialic acid; Chemical: mannosylated PPI; Chemical: ( 1 ) H
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PPI; Chemical: sialic acid; Chemical: PPI; Chemical: mannose; Chemical: PPI; Chemical: sialic acid; Chemical: mannosylated PPI; Chemical: ( 1 ) H