Sl. No Name of the Intermediate CAS No. Intermediate in API
1. 4-(1-Pyrrolidinylsulphonylmethyl)-phenylhydrazine hydrochloride [334981-11-2] Almotriptan Malate
2. (1S,2S,3R,5S)-Pinanediol-1-ammoniumtrifluoroacetate-3-methylbutane-1-boronate [179324-87-9] Bortezomib
3. 5-Bromo-3-(((R)-1-methylpyrrolidin-2-yl)methyl)-1H-indole [143322-57-0] Eletriptan Hydrobromide
4. 1-(Vinylsulfonyl)benzene (OR) Phenyl Vinyl Sulfone [5535-48-8] Eletriptan Hydrobromide
5. (S)-Phenyl-1,2,3,4-tetrahydroisoquinoline [118864-75-8] Solifinacin
6. 4-Hydrazino-N-methyl benzene methane sulphonamide hydrochloride [88933-16-8] Sumatriptan Succinate
7. (1R,3R)-Methyl-1-(benzo[d][1,3]dioxol-5-yl)-2-(2-chloroacetyl)-2,3,4,9-tetrahydro-1H- pyrido[3,4-b]indole-3-carboxylate [171489-59-1] Tadalafil
 8. (S)-4-(4-Aminobenzyl)-2-oxazolidinone [152305-23-2] Zolmitriptan
9. 4-(2,3-Epoxypropoxy)carbazole [51997-51-4] Carvedilol
10. (R)-N-[[3-[3-Fluoro-4-morpholinyl]phenyl]-2-oxo-5-oxazolidinyl]methanol [168828-82-8] Linezolid