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E.Hydroxyethylaminelibrary Thecompoundsinthislibrarywereattachedtopolyethyleneglycol-graftedpolystyrene resinviathep-hydroxybenzyl(PHB)linkerwhichreleasesitsligandwhenexposedto acid(Figure23)[37].ThePHBlinkeristhemostrobustmemberofaseriesof commerciallyavailableacid-cleavablelinkers,andoffersanalternativetothe photocleavablelinker.Theabilitytousedifferentlinkersforsolidphasesynthesisisvery importantforincreasingtherangeofsyntheticconditionsthatcanbeusedforligand construction.