Question: What is the chemical formula for the acid used in boracic lint? 

Context paragraphs:
Carbonic acid: Carbonic acid is a chemical compound with the chemical formula HCO (equivalently OC(OH)).  It is also a name sometimes given to solutions of carbon dioxide in water (carbonated water), because such solutions contain small amounts of HCO.  In physiology, carbonic acid is described as "volatile acid" or "respiratory acid", because it is the only acid excreted as a gas by the lungs.  It plays an important role in the bicarbonate buffer system to maintain acid–base homeostasis.

Maleic acid: Maleic acid or "cis"-butenedioic acid is an organic compound that is a dicarboxylic acid, a molecule with two carboxyl groups.  Its chemical formula is HOCCHCHCOH.  Maleic acid is the "cis"-isomer of butenedioic acid, whereas fumaric acid is the "trans"-isomer.  It is mainly used as a precursor to fumaric acid, and relative to its parent maleic anhydride, maleic acid has few applications.

Boracic lint: Boracic lint was a type of medical dressing made from surgical lint that was soaked in a hot, saturated solution of boracic acid and glycerine and then left to dry.

Boric acid: Boric acid, also called hydrogen borate, boracic acid, orthoboric acid and acidum boricum , is a weak, monobasic Lewis acid of boron, which is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds.  It has the chemical formula HBO (sometimes written B(OH)), and exists in the form of colorless crystals or a white powder that dissolves in water.  When occurring as a mineral, it is called sassolite.

Structural formula: The structural formula of a chemical compound is a graphic representation of the molecular structure, showing how the atoms are arranged.  The chemical bonding within the molecule is also shown, either explicitly or implicitly.  Unlike chemical formulas, which have a limited number of symbols and are capable of only limited descriptive power, structural formulas provide a complete geometric representation of the molecular structure.  For example, many chemical compounds exist in different isomeric forms, which have different enantiomeric structures but the same chemical formula.  A structural formula is able to indicate arrangements of atoms in three dimensional space in a way that a chemical formula may not be able to do.

Calcium lactate gluconate: Calcium lactate gluconate, also known as GLOCAL, is a soluble salt of calcium, lactic acid and gluconic acid used in effervescent calcium tablets.  Its chemical formula is Ca(CHO)·(CHO)·2HO.  It was first developed by Sandoz, Switzerland.  Calcium lactate gluconate is used in the functional and fortified food industry due to its good solubility and neutral taste.  In addition, it is used in various spherification techniques in molecular gastronomy.  It can also be used to help neutralize HF (hydrofluoric acid) poisoning.

Gallic acid: Gallic acid (also known as 3,4,5-trihydroxybenzoic acid) is a trihydroxybenzoic acid, a type of phenolic acid, found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plants.  The chemical formula of gallic acid is CH(OH)COOH.  It is found both free and as part of hydrolyzable tannins.  The gallic acid groups are usually bonded to form dimers such as ellagic acid.  Hydrolyzable tannins break down on hydrolysis to give gallic acid and glucose or ellagic acid and glucose, known as gallotannins and ellagitannins, respectively.

Phosphoric acid: Phosphoric acid (also known as orthophosphoric acid or phosphoric(V) acid) is a mineral (inorganic) acid having the chemical formula HPO.  Orthophosphoric acid refers to "phosphoric acid", which is the IUPAC name for this compound.  The prefix "ortho-" is used to distinguish the acid from related phosphoric acids, called polyphosphoric acids.  Orthophosphoric acid is a non-toxic acid, which, when pure, is a solid at room temperature and pressure.  The conjugate base of phosphoric acid is the dihydrogen phosphate ion, H2PO4− , which in turn has a conjugate base of hydrogen phosphate, HPO42− , which has a conjugate base of phosphate, PO43− .  Phosphates are essential for life.

Acetic acid: Acetic acid , systematically named ethanoic acid , is a colourless liquid organic compound with the chemical formula CHCOOH (also written as CHCOH or CHO).  When undiluted, it is sometimes called "glacial acetic acid".  Vinegar is roughly 3–9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.  Acetic acid has a distinctive sour taste and pungent smell.  In addition to household vinegar, it is mainly produced as a precursor to polyvinyl acetate and cellulose acetate.  It is classified as a weak acid since it only partially dissociates in solution, but concentrated acetic acid is corrosive and can attack the skin.

MES (buffer): MES is the common name for the compound 2-("N"-morpholino)ethanesulfonic acid.  Its chemical structure contains a morpholine ring.  It has a molecular weight of 195.2 and the chemical formula is CHNOS.  Synonyms include: 2-morpholinoethanesulfonic acid; 2-(4-morpholino)ethanesulfonic acid; 2-(N-morpholino)ethanesulfonic acid; 2-(4-morpholino)ethanesulfonic acid; MES; MES hydrate; and morpholine-4-ethanesulfonic acid hydrate.  MOPS is a similar pH buffering compound which contains a propanesulfonic moiety instead of an ethanesulfonic one.

Supporting paragraphs: Boracic lint Boric acid
Answer: HBO