Sulfo-Cyanine5 Carboxylic Acid易溶于水，并且含有单个羧基，可以用于和氨基/羟基的偶联，也常用于仪器参数的校准。
General properties
| Appearance: | blue powder |
| Molecular weight: | 694.18 |
| Molecular formula: | C33H39N2KO8S2 |
| CAS number: | 146368-11-8 |
| Solubility: | very high in water |
| Quality: | HPLC (95+%) |
| Storage conditions): | Storage: 24 months after receival at -20°C in the dark. Avoid prolonged exposure to light. |
| Molar Extinction maximum: | 271 000 L*mol-1*cm-1 |
| Excitation maximum): | 646nm |
| Emission maximum): | 662nm |