1-Hydroxy-2-propyne 1-Propyn-3-ol 1-Propyn-3-yl alcohol 107-19-7 2-Propyn-1-ol 2-Propynol 2-Propynyl alcohol 3-Hydroxy-1-propyne 3-Propynol C05986 Ethynylcarbinol NA 1986 Prop-2-in-1-ol Prop-2-yn-1-ol Prop-2-yne-1-ol Propargyl alcohol Propynyl alcohol