The cyclic multifunctional linker of claim 12, wherein A 1, A 2, A 3, B 1, B 2, B 3, L 1, L 2, L 3, L 4, L 5, L 6, a 1, a 2, b 1, and b 2, when present, are each independently selected from:Ģ0. The cyclic multifunctional linker of claim 17, wherein a 1, a 2, b 1, and b 2 are each independently selected from a photo-cleavable moiety, an enzyme-cleavable moiety, a ribozyme-cleavable moiety, a redox-cleavable moiety, an acid-cleavable moiety, a base-cleavable moiety, a nucleophile-cleavable moiety, an electrophile-cleavable moiety, an organometallic moiety having one or more chelating agents, a double-stranded DNA, a temperature-cleavable moiety, and a hydrolyzable moiety.ġ9. The cyclic multifunctional linker of claim 12, wherein at least one of A 1, A 2, A 3, B 1, B 2, and B 3, when present, is wherein a 1, a 2, b 1, and b 2 are each independently a cleavable moiety configured to cleave when exposed to a stimulus i and k are each independently 1 j and 1 are each independently selected from 0 or 1.ġ8. The cyclic multifunctional linker of claim 12, provided that at least A 1 and B 1 are different.ġ7. The cyclic multifunctional linker of claim 12, wherein A 1, A 2, A 3, B 1, B 2, B 3, L 1, L 2, L 3, L 4, L 5, and L 6, when present, are each independently selected from a photo-cleavable moiety, an enzyme-cleavable moiety, a ribozyme-cleavable moiety, a redox-cleavable moiety, an acid-cleavable moiety, a base-cleavable moiety, a nucleophile-cleavable moiety, an electrophile-cleavable moiety, an organometallic moiety having one or more chelating agents, a double-stranded DNA, a temperature-cleavable moiety, and a hydrolyzable moiety.ġ6. The cyclic multifunctional linker of claim 1, having Formula (I): wherein A 1, A 2, A 3, B 1, B 2, B 3, L 1, L 2, L 3, L 4, L 5, and L 6 are each independently a cleavable moiety configured to cleave when exposed to a stimulus a and m are each independently selected from 1, 2, and 3 b, c, n, and o are each independently selected from 0, 1, 2, and 3 v and w are each independently selected from 0, 1, and 2 u and x are each independently selected from 0, 1, and 2 y is selected from 0, 1, and 2 z is selected from 0, 1, and 2 and h is selected from 0, 1, 2, or 3.ġ5. The cyclic multifunctional linker of claim 9, wherein the two or more stimuli are independently selected from light of a predetermined wavelength, an enzyme, a reductant, an oxidant, a nucleophile, an electrophile, a chelating agent, a DNA, pH, water, a predetermined temperature, or any combination thereof.ġ2. The cyclic multifunctional linker of claim 8, wherein the multifunctional linker releases the crosslinked moieties when exposed to two or more stimuli configured to cleave two or more of the cleavable moieties.ġ1. The cyclic multifunctional linker of claim 7, wherein the multifunctional linker is bonded to the crosslinkable moieties to provide crosslinked moieties.ĩ. The cyclic multifunctional linker of claim 1, wherein the multifunctional linker is configured to crosslink crosslinkable moieties independently selected from oligomers, DNA, polymers, hydrogels, proteins, peptides, cells, tissues, organs, therapeutic agents, small molecules, particles (e.g., nanoparticles, microparticles), surfaces, biomaterials, ceramics, composites, glass, metals, and any combinations thereof.Ĩ. The cyclic multifunctional linker of claim 1, wherein the multifunctional linker is a small molecule having a molecular weight of 100 Da or more and 2000 or less.ħ. The cyclic multifunctional linker of claim 1, wherein the connecting chains are independently selected from a peptide, a DNA strand, a RNA strand, a polymer, an oligomer, a polysaccharide, and any combination thereof.Ħ.

The cyclic multifunctional linker of claim 1, wherein the cleavable moieties are independently selected from a photo-cleavable moiety, an enzyme-cleavable moiety, a ribozyme-cleavable moiety, a redox-cleavable moiety, an acid-cleavable moiety, a base-cleavable moiety, a nucleophile-cleavable moiety, an electrophile-cleavable moiety, an organometallic moiety having one or more chelating agents, a double-stranded DNA, a temperature-cleavable moiety, and a hydrolyzable moiety.ĥ. A cyclic multifunctional linker, comprising: at least two cleavable moieties at least two connecting chains connected to the at least two cleavable moieties to provide a cyclic structure, wherein each connecting chain has at least two ends, and at least two of the connecting chains are each connected at each end to a cleavable moiety and at least two linking groups, each linking group being bonded at one end to a connecting chain and being located between two cleavable moieties, and each linking group having a second end configured to bond to crosslinkable moieties.Ĥ.

Hydroxyethyl photolinker caged