nonself; nonself but of the same species.
isomeric; especially, of amino acids having two chiral centres, the second diastereoisomer to be discovered or synthesized
a diastereomer having the same configuration on four neighboring chiral carbon atoms as carbohydrate allose
different; other.
variant.
unequal; not the same; not the selfsame: forming compounds words; often formed to contrast with similar words in iso-).