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2-(1H-Pyrrol-1-yl)benzoic acid, also known as 1‑(2‑carboxyphenyl)pyrrole or 2‑(1‑pyrrolyl)benzoic acid, is an organic compound characterized by a pyrrole ring directly substituted with an ortho‑carboxyphenyl group [7+L3-L8]. With a molecular formula of C₁₁H₉NO₂ and a molecular weight of 187.19 g/mol, this unique structure combines the electron‑rich nature of the pyrrole heterocycle with the versatile reactivity of a carboxylic acid (–COOH) at the benzylic ortho position [3+L18-L19]. This distinctive arrangement makes it an ideal fragment molecule and molecular scaffold for linking, expanding, and modifying new chemical entities [6+L12-L16].

ETHYL 4-(1H-PYRROL-1-YL)BENZOATE (CAS: 5044‑37‑1, molecular formula: C₁₃H₁₃NO₂, molecular weight: 215.25 g/mol) is an organic compound featuring a pyrrole ring linked to a benzoate ester backbone. The molecule consists of a para‑substituted benzoic acid ethyl ester with a pyrrole moiety attached through the nitrogen atom to the aromatic ring. This structural motif places it at the crossroads of heterocyclic chemistry and aromatic ester chemistry, offering a distinctive combination of electronic and steric properties.

5-Aminofluorescein (CAS: 3326-34-9, molecular formula: C₂₀H₁₃NO₅, molecular weight: 347.32) belongs to the amino‑substituted fluorescein family. It features a fluorescein backbone with an amino group (–NH₂) at the 5‑position (Isomer I), appearing as a reddish‑brown to dark brown crystalline powder that emits bright green fluorescence upon excitation. The molecule consists of a xanthene core bridged by an oxygen atom, with the amino group providing a versatile handle for covalent conjugation.

D-Glucaric Acid (CAS: 87-73-0, molecular formula: C₆H₁₀O₈, molecular weight: 210.14), also known as Saccharic Acid or D-Saccharic Acid, is a naturally occurring dicarboxylic acid derived by oxidizing a sugar such as glucose with nitric acid. The compound features four chiral centers in its backbone and contains two carboxylic acid groups along with four secondary hydroxyl groups, making it a highly functionalized small molecule with exceptional chelating properties.