prov:value
| - R15 is a protecting group of the functional group Q, and, when Q is amino group, R15 is, for example, carbamate (e.g. methoxycarbonyl, ethoxycarbonyl, propyloxycarbonyl, isopropyloxycarbonyl, tert-butoxycarbonyl, benzyloxycarbonyl or 9-fluorenylmethoxycarbonyl), amido (e.g. chloroacetyl), or silyl group (e.g. trimethylsilyl, triethylsilyl, dimethyl-tert-butylsilyl or diphenyl-tert-butylsilyl); whi
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