prov:value
| - In this structure, R9 is hydrogen, substituted or unsubstituted alkyl (preferably of 1 to 12 carbon atoms, e.g. methyl, ethyl, isopropyl, benzyl, phenethyl, etc.), substituted or unsubstituted hydroxyalkyl (preferably of 1 to 12 carbon atoms, e.g. hydroxymethyl, 2-hydroxyethyl, 2-hydroxyisopropyl, etc.), or substituted or unsubstituted alkoxycarbonyl (preferably of 2 to 12 carbon atoms, e.g. metho
|