"A photocleavable linker for the preparation of carboxylic acids. 4-[4-(1-Hydroxyethyl)-2-methoxy-5-nitrophenoxy]butyric acid is a photolabile linker which can be bound to amino- and hydroxymethyl resins. In the synthesis of sensitive acids, 4-[4-(1-Hydroxyethyl)-2-methoxy-5-nitrophenoxy]butyric acid may also play a key role. 4-[4-(1-Hydroxyethyl)-2-methoxy-5-nitrophenoxy]butyric acid may be used in the solid phase preparation of carboxylic acids. Used for preparation of photolabile linking groups for use in solid phase synthesis."