Ropivacaine is not the S-isomer of bupivacaine.
Biccard
B
B
D000577:Amides / Q000737:chemistry*; D000779:Anesthetics, Local / Q000737:chemistry*; D002045:Bupivacaine / Q000737:chemistry*; D000077212:Ropivacaine; D013237:Stereoisomerism
D000577:Amides; D000779:Anesthetics, Local; D000077212:Ropivacaine; D002045:Bupivacaine