1,2,4-Trihydroxyanthraquinone, commonly called purpurin, is an anthraquinone. It is a naturally occurring red/yellow dye. It is formally derived from 9,10-anthraquinone by replacement of three hydrogen atoms by hydroxyl (OH) groups.

CAS：81-54-9
中文别名：紫素;1,2,4-三羟基蒽醌;羟基茜草素;1,2,4-三羟蒽醌;红紫素/1,2,4-三羟蒽醌;红紫素;
英文别名：9,10-Anthracenedione, 1,2,4-trihydroxy-;1,2,4-Trihydroxy-9,10-anthraquinone;Verantin;1,2,4-Trihydroxy-9,10-anthracenedione;Purpurine;1,2,4-trihydroxyanthracene-9,10-dione;1,2,4-trishydroxy-9,10-anthraquinone;PURPURIN;1,2,4-Trihydroxyanthraquinone;Hydroxylizaric acid;Smoke Brown G;natural red 16;
分子式：C14H8O5
分子量：256.21
精确质量：256.037
Psa：94.83
Logp：1.5788

UNII：L1GT81LS6N

密度：1.659 g/cm3
沸点：525.1ºC at 760 mmHg
熔点：253-256ºC(lit.)
闪点：113ºC
折射率：1.772

危险类别码：R36/37/38
海关编码：2914690090
危险品标志：Xi

用途
细胞核染色。检测锆、硼、钙和氟。