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Pentamethylcyclopentadiene CAS: 4045-44-7Pentamethylcyclopentadiene (CAS: 4045-44-7) is important for catalytic reaction.
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1,2,2,6,6-PENTAMETHYL-4-PIPERIDINOL CAS2403-89-6hindered amine light stabilizer (important intermediates
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4,4-PENTAMETHYLENE-2-PYRROLIDINONE CAS64744-50-9Used as a drug gabapentin intermediates