| http://www.w3.org/ns/prov#value | - The groups R.sup.1, R.sup.13, R.sup.6, R.sup.7, R.sup.4 and R.sup.5 together, and R.sup.5 and R.sup.6 together, when each is other than hydrogen, can be introduced to the erythronolide ring (for R.sup.1, R.sup.13, R.sup.6, R.sup.4 and R.sup.5
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