A potassium salt, C8H6NO4SK, found in sweat and urine and formed by the conversion of tryptophan to indole by intestinal bacteria.
A glucoside, C14H17NO6, occurring in the indigo plant and used as a source for indigo dye.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.