R1 R2 R3 R4 H H H B r b H H H H Me H H H d H Ph H Br e H Ph H H Me Ph H H A c H H H Me Ac Ac H ... Synthesis of Spiro[indoline-3,2'(3'H)-[ 1,3,4] thiadiazolinel-2-ones by Acetylation of Isatin-P-thiosemicarbazones ... R1 R2 R3 R4 Ac Ac AcHN Br Ac Ac AcHN H ... Me Ac Ac AcHN cPhN H Rr Ac Ac AcPhN H Me Ac AcPhN H H Ac AcHN Br h H H P h H A c H Ph H ... Research Group for Antibiotics, Hungarian Academy of Sciences, PO Box 70, H-4010 Debrecen, ...