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(a) Postsynthetic modification of DNA with porphyrins through click chemistry or Diels–Alder reaction; the flexibility of the linker allows the porphyrin to intercalate into the DNA.43 (b) Attachment of the porphyrins through the β-pyrrolic position reduces steric hindrances, leading to stable H-aggregates of the porphyrins in the minor groove. Reprinted by permission of John Wiley & Sons, Inc. from ref (44).
