(2E)-but-2-enal + hydrogen cyanide <=> (2S,3E)-2-hydroxypent-3-enenitrile
(2e)-but-2-enal + hydrogen cyanide <=> (2s,3e)-2-hydroxypent-3-enenitrile
(2E)-but-2-enal + hydrogen cyanide <=> (2S,3E)-2-hydroxypent-3-enenitrile
(2e)-but-2-enal + hydrogen cyanide <=> (2s,3e)-2-hydroxypent-3-enenitrile