4-(2-Carboxyethyl)benzeneboronic acid → Sodium (E)-2-((2Z,4E)-3-(4-(2-Carboxyethyl)phenyl)-5-(5-chloro-3,3-dimethyl-7-(3-sulfonatopropyl)-3H-pyrrolo[2,3-b]pyridin-7-ium-2-yl)penta-2,4-dienylidene)-3,3-dimethyl-1-(3-sulfonatopropyl)indoline-5-sulfonate

Participants

Role	Name	HCID	Charge
Reactant	4-(2-Carboxyethyl)benzeneboronic acid	HCID 3863484	—
Reactant	Sodium (E)-2-((2Z,4E)-3-(3-(2-Carboxyethyl)phenyl)-5-(5-chloro-3,3-dimethyl-7-(3-sulfonatopropyl)-3H-pyrrolo[2,3-b]pyridin-7-ium-2-yl)penta-2,4-dienylidene)-3,3-dimethyl-1-(3-sulfonatopropyl)indoline-5-sulfonate	HCID 86699470	—
Product	Sodium (E)-2-((2Z,4E)-3-(4-(2-Carboxyethyl)phenyl)-5-(5-chloro-3,3-dimethyl-7-(3-sulfonatopropyl)-3H-pyrrolo[2,3-b]pyridin-7-ium-2-yl)penta-2,4-dienylidene)-3,3-dimethyl-1-(3-sulfonatopropyl)indoline-5-sulfonate	HCID 57329549	—

Compound 12 is prepared analogously to compound 10 (Example 10), except that 4-(2-carboxyethyl)phenylboronic acid is used as a starting material.