Question: Nonactin is a member of a family of naturally occurring cyclic ionophores known as the macrotetrolide antibiotics,Nonactin is soluble in methanol, dichloromethane, ethyl acetate and which is an organosulfur compound with the formula (CH)SO?
Context: Dimethyl sulfoxide (DMSO) is an organosulfur compound with the formula (CH)SO.  This colorless liquid is an important polar aprotic solvent that dissolves both polar and nonpolar compounds and is miscible in a wide range of organic solvents as well as water.  It has a relatively high melting point.  DMSO has the unusual property that many individuals perceive a garlic-like taste in the mouth after contact with the skin. 1,5-Dithiacyclooctane is an organosulfur compound with the formula (CH)S.  This cyclic dithioether is a colorless oil that is soluble in polar solvents.  It is studied as a chelating ligand and as an unusual example of an electroactive saturated compound.  It was first prepared in 4% yield by dialkylation of 1,3-propanedithiol with 1,3-dibromopropane. Ethanethiol, commonly known as ethyl mercaptan, is a clear liquid with a distinct odor.  It is an organosulfur compound with the formula CHCHSH.  Abbreviated EtSH, it consists of an ethyl group (Et), CHCH, attached to a thiol group, SH.  Its structure parallels that of ethanol, but with sulfur in place of oxygen.  The odor of EtSH is infamous.  Ethanethiol is more volatile than ethanol due to a diminished ability to engage in hydrogen bonding.  Ethanethiol is toxic.  It occurs naturally as a minor component of petroleum, and may be added to otherwise odorless gaseous products such as liquefied petroleum gas (LPG) to help warn of gas leaks.  At these concentrations, ethanethiol is not harmful. Thiosalicylic acid is an organosulfur compound containing carboxyl and sulfhydryl functional groups. Its molecular formula is CH(SH)(COH).  it is a yellow solid that is slightly soluble in water, ethanol and diethyl ether, and alkanes, but more soluble in DMSO. Nonactin is a member of a family of naturally occurring cyclic ionophores known as the macrotetrolide antibiotics.  The other members of this homologous family are monactin, dinactin, trinactin and tetranactin which are all neutral ionophoric substances and higher homologs of nonactin.  Collectively, this class is known as the nactins. Nonactin is soluble in methanol, dichloromethane, ethyl acetate and DMSO, but insoluble in water. Ethyl acetate (systematically ethyl ethanoate, commonly abbreviated EtOAc or EA) is the organic compound with the formula CH−COO−CH−CH, simplified to CHO.  This colorless liquid has a characteristic sweet smell (similar to pear drops) and is used in glues, nail polish removers, decaffeinating tea and coffee, and cigarettes (see list of additives in cigarettes).  Ethyl acetate is the ester of ethanol and acetic acid; it is manufactured on a large scale for use as a solvent.  The combined annual production in 1985 of Japan, North America, and Europe was about 400,000 tonnes.  In 2004, an estimated 1.3 million tonnes were produced worldwide. Bis(triethoxysilylpropyl)tetrasulfide is an organosulfur compound with the formula S[CHSi(OEt)] (Et = CH).  The molecule consists of two trialkoxysilyl propyl groups linked with a polysulfide.  It is often sold as a mixture with the trisulfide.  The compound is a colorless viscous liquid that is soluble in ordinary organic solvents such as toluene.  Commercial samples often are yellowish.  The compound is added to rubber compositions that contain silica filler. Methyl acetate, also known as MeOAc, acetic acid methyl ester or methyl ethanoate, is a carboxylate ester with the formula CHCOOCH.  It is a flammable liquid with a characteristically pleasant smell reminiscent of some glues and nail polish removers.  Methyl acetate is occasionally used as a solvent, being weakly polar and lipophilic, but its close relative ethyl acetate is a more common solvent being less toxic and less soluble in water.  Methyl acetate has a solubility of 25% in water at room temperature.  At elevated temperature its solubility in water is much higher.  Methyl acetate is not stable in the presence of strong aqueous bases or aqueous acids. Methyl acetate is not considered as a VOC. Production of antibiotics is a naturally occurring event, that thanks to advances in science can now be replicated and improved upon in laboratory settings.  Due to the discovery of penicillin by Alexander Fleming, and the efforts of Florey and Chain in 1938, large-scale, pharmaceutical production of antibiotics has been made possible.  As with the initial discovery of penicillin, most antibiotics have been discovered as a result of happenstance.  Antibiotic production can be grouped into three methods: natural fermentation, semi-synthetic, and synthetic.  As more and more bacteria continue to develop resistance to currently produced antibiotics, research and development of new antibiotics continues to be important.  In addition to research and development into the production of new antibiotics, repackaging delivery systems is important to improving efficacy of the antibiotics that are currently produced.  Improvements to this field have seen the ability to add antibiotics directly into implanted devices, aerosolization of antibiotics for direct delivery, and combination of antibiotics with non antibiotics to improve outcomes.  The increase of antibiotic resistant strains of pathogenic bacteria has led to an increased urgency for the funding of research and development of antibiotics and a desire for production of new and better acting antibiotics. Sulfolane (also "tetramethylene sulfone", systematic name: 2,3,4,5-tetrahydrothiophene-1,1-dioxide) is an organosulfur compound, formally a cyclic sulfone, with the formula (CH)SO.  It is a colorless liquid commonly used in the chemical industry as a solvent for extractive distillation and chemical reactions.  Sulfolane was originally developed by the Shell Oil Company in the 1960s as a solvent to purify butadiene.  Sulfolane is a polar aprotic solvent, and it is readily soluble in water.
Answer: DMSO