Dictionary.com
Thesaurus.com

pyridoxal

British  
/ ˌpɪrɪˈdɒksəl /

noun

  1. biochem a naturally occurring derivative of pyridoxine that is a precursor of a coenzyme ( pyridoxal phosphate ) involved in several enzymic reactions. Formula: (CH 2 OH)(CHO)C 5 HN(OH)(CH 3 )

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012