tachysterol(redirected from ertacalciol)
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An inactive compound, C28H44O, that is formed by irradiation of a precursor of vitamin D3 and can be converted back into that precursor.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.