| http://www.w3.org/ns/prov#value | - cyclization of hydroxy acids to lactones, or conversion of enol tautomers to keto tautomers; and the steroid may be substituted by replacing one or more hydrogen atoms with a group independently selected from the group consisting of H, hydroxy, nitro, cyano, halogen, COOH, SO3 H, CH2 SO2 NH2, trifluoroacetyl, an acid group of the structure ZOq Hr wherein Z is an element selected from the group con
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