prov:value
| - is substituted, especially in the 4-position, by C1 -C4 -alkyl, such as methyl, C1 -C4 alkoxy, such as methoxy, halogen having an atomic number of up to and including 35, such as chlorine, trifluoromethyl or by C1 -C4 alkoxycarbonyl, such as methoxycarbonyl, R4 is carboxy, and R5 is hydrogen, and when n is 1, the chain carbon atom bonded to the sulfur atom preferably has the (R)-configuration and
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