@Brian_BH Could you share the rationale for 402619 & 403206? Or if they are the same as for 403457 - either way works 
Both are using the same rationale, in those cases to discriminate against it being an enantiomer (as a negative discriminator), as in each case you’re looking for a diastereomer as the correct answer (so it can’t be a mirror image, etc.), though enantiomer is an answer option in both that must be eliminated in order to arrive at the correct answer choice.
1 Like