▁Category : 1 9 9 0 ▁death s ▁Category : G ro ton ▁School ▁al umn i ▁Category : Har vard ▁University ▁al umn i ▁Category : Pol it icians ▁from ▁New ▁York ▁City ▁Category : Un ited ▁States ▁Bureau ▁of ▁Education ▁people <0x0A> </s> ▁Tax anes ▁are ▁a ▁class ▁of ▁d iter pen es . ▁They ▁were ▁originally ▁identified ▁from ▁plants ▁of ▁the ▁genus ▁Tax us ▁( y ew s ), ▁and ▁feature ▁a ▁tax ad iene ▁core . ▁Pac lit ax el ▁( T ax ol ) ▁and ▁doc et ax el ▁( T ax ot ere ) ▁are ▁widely ▁used ▁as ▁chem other apy ▁agents . ▁Cab az it ax el ▁was ▁F DA ▁approved ▁to ▁treat ▁h orm one - ref ract ory ▁pro state ▁cancer . ▁▁ ▁Tax anes ▁present ▁difficulties ▁in ▁form ulation ▁as ▁medic ines ▁because ▁they ▁are ▁poor ly ▁sol ub le ▁in ▁water . ▁ ▁Production ▁ ▁As ▁their ▁name ▁suggests , ▁tax anes ▁were ▁first ▁derived ▁from ▁natural ▁sources , ▁but ▁some ▁have ▁been ▁sem is yn thes ized . ▁Pac lit ax el ▁was ▁originally ▁derived ▁from ▁the ▁Pacific ▁y ew ▁tree . ▁Tax anes ▁are ▁difficult ▁to ▁synth es ize ▁because ▁of ▁their ▁numerous ▁ch iral ▁cent res ▁— ▁tax ol ▁has ▁ 1 1 ▁of ▁these . ▁ ▁Rec ently , ▁the ▁presence ▁of ▁tax anes ▁in ▁the ▁shell s ▁and ▁leaves ▁of ▁C ory lus ▁av ell ana ▁( the ▁common ▁ha zel ▁plant ) ▁has ▁been ▁reported .