GE$15$

$($C$.$H$.$COOH$)-$ CH$,+$ CHOOH $($CH$-$COOH$).($CH$)($CHOOH$),1$:$2,10\text{'}),,=4(10\text{'}.80.\%.523$K $5.,=150$; $,6=10$; $,(=0\mathrm{.}5$; $,(=3000\text{'}$; $,=5.$: C$2$H$4$: CHOOH $94$:$2$:$4.$