Melting point :280-282 °C(lit.)
alpha :D25 +58° ±5° (0.04 g in 1 ml dioxane)
Boiling point :370.61°C (rough estimate)
Density :1.27
refractive index :58 ° (C=0.4, Dioxane)
Flash point :9℃
storage temp. :2-8°C
solubility :Practically insoluble in water, sparingly soluble in ethanol (96 per cent).
pka :pKa 10.38±0.02(H2O t=23±2 Iunspeci?ed) (Uncertain)
color :White to Off-White
Water Solubility :3.2mg/L(25 ºC)
Merck :3707
BRN :2508172
InChIKey :PROQIPRRNZUXQM-ZXXIGWHRSA-N
CAS DataBase Reference :50-27-1(CAS DataBase Reference)
NIST Chemistry Reference :Estriol(50-27-1)
EPA Substance Registry System :Estriol (50-27-1)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501 H362 May cause harm to breast-fed children Reproductive toxicity, effects on or via lactation Additional category P201, P260, P263, P264, P270,P308+P313
Precautionary statements:	P201 Obtain special instructions before use. P202 Do not handle until all safety precautions have been read and understood. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P263 Avoid contact during pregnancy/while nursing. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P308+P313 IF exposed or concerned: Get medical advice/attention.