苏糖

苏糖[1]
	IUPAC名; (2S,3R)-2,3,4-Trihydroxybutanal (D); (2R,3S)-2,3,4-Trihydroxybutanal (L)
别名	Threotetrose
识别
CAS号	95-44-3（(L)） ; 95-43-2（(D)）
PubChem	439665（(D)）
ChemSpider	388736
SMILES	O=C[C@@H](O)[C@H](O)CO;
InChI	1/C4H8O4/c5-1-3(7)4(8)2-6/h1,3-4,6-8H,2H2/t3-,4-/m1/s1;
InChIKey	YTBSYETUWUMLBZ-QWWZWVQMBY
ChEBI	28587
性质
化学式	C4H8O4
摩尔质量	120.1 g·mol−1
外观	漿狀
溶解性（水）	非常易溶
	若非注明，所有数据均出自一般条件（25 ℃，100 kPa）下。

苏糖[2]（英語：，C₄H₈O₄）在分类上属于丁糖与醛糖，从费希尔式的角度看，中间两个碳原子上的羟基在碳骨架的异侧。

赤式和苏式

有机化学的习惯命名法中，使用“苏”或“苏式”（"threo"）表示相邻两碳相同官能团在费歇尔投影式中处于异侧的构型。[3]这种命名源自苏糖的构型。相对的，两个官能团在同侧的为赤式构型（"erythro"）。[3][4]赤式和苏式为差向异构体。

费歇尔投影式表示的两种构型的苏糖

Merck Index, 11th Edition, 9317
Formulas Using Other Configurational Notations, W. Rausch, accessed 1 March 2011
Prof. Rausch helpfully notes that the prefixes "may be applied to racemic compounds, as well as pure enantiomers and meso compounds", and that when depicted in the common "zig-zag" representation, adjacent "substituents may lie on the same side of the carbon chain... [syn] or on opposite sides... [anti]", which is opposite of their depiction in a Fischer projection.

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