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In the title compound, C 30 H 30 N 4 O 7 S, the two spiro junctions link a planar 2-oxindole ring [with a mean deviation from the plane of 0.0319 (3) Å, a pyrrolidine ring in an envelope conformation and a thia­zolo[3,2- a ]pyrimidine system. Two mol­ecules are connected into a dimer by two N—H⋯O hydrogen bonds, forming an  R22 (8) graph-set motif. The title compound has four stereogenic centers and appears as a racemic mixture of one single diastereoisomer ( RSRR / SRSS ).

acta crystallographica. section e

rac-(4R,17S,18R,26R)-Ethyl 4′-methoxycarbonyl-5′′-(4-methoxyphenyl)-1′-methyl-2,3′′-dioxo-2′′,3′′-dihydroindoline-3-spiro-2′-pyrrolidine-3′-spiro-2′′-thiazolo[3,2-a]pyrimidine-6′′-carboxylate