gle ar basic organic ari ni... ade ke patut tnya structure tatrtaric acid... dh la x bg formula molecule lngsng... kn dh nganga... aku ni mmg terblur gle smpai preparation caboxylic acid pom x tau nk gorng cam mn dh... mmg otak dh thp beku bwh 0 dgree ar... wagagagagagagaga
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