Contain(s) propionic and acetic acid side chains on pyrrole rings:

    1. Uroporphyrinogen I
    2. Uroporphyrin III
  1. A only
  2. B only
  3. Both A and B
  4. Neither A or B


Uro- denotes propionic and acetic acid groups.
Copro- denotes propionic acid and methyl groups.
Proto- denotes propionic acid, methyl and vinyl groups.

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