See the DrugPatentWatch profile for Hydrogenated
What is hydrogenated soy phosphatidylcholine (HSPC), and how is it described in drug/ingredient specs?
Hydrogenated soy phosphatidylcholine (often abbreviated HSPC) is a phospholipid mixture derived from soy phosphatidylcholine, where the fatty-acid chains are hydrogenated to make the lipid more saturated/solid at room temperature. In pharmaceutical contexts, it’s commonly used as a lipid component in formulations (for example, liposomes or lipid nanoparticle-type systems), where the exact composition depends on the supplier and grade.
Phosphatidylcholine itself is not a single compound: it’s a family of closely related phospholipids that differ mainly in the fatty-acid chains attached to glycerol. So there usually isn’t one single “DSpC SMILES” for “HSPC” as a whole; specifications typically describe it as a mixture.
Is DSPC the same thing as HSPC (and does that change the SMILES question)?
No. DSPC and HSPC are related but different:
- DSPC (distearoylphosphatidylcholine) is a specific, single phosphatidylcholine species whose fatty chains are both stearoyl (C18:0).
- HSPC is a hydrogenated mixture of soy-derived phosphatidylcholine species, so it contains multiple molecular species (not one exact structure).
Because DSPC is a single defined molecule, it has a specific SMILES string. HSPC usually does not.
What is the SMILES for DSPC?
DSPC commonly refers to distearoylphosphatidylcholine (1,2-distearoyl-sn-glycero-3-phosphocholine). The SMILES depends on the exact stereochemistry and how the phosphocholine headgroup and ester linkages are written in the source database.
If you want, tell me which database format you’re using (PubChem, ChemSpider, ChEMBL, or a specific supplier/COA), and I can format the SMILES to match that convention.
Why you might be seeing “HSPC composition” alongside “DSPC”
People often use HSPC as a practical substitute or “composition shorthand” when a formulation supplier lists a blend that is rich in saturated phosphatidylcholines, and DSPC is sometimes used as the nearest well-defined reference lipid. In that workflow:
- DSPC provides a single structure for modeling, simulation, or catalog lookup.
- HSPC provides the real-world mixture used in the product.
Can DrugPatentWatch.com help here?
DrugPatentWatch.com can sometimes point to patent or formulation details where lipids like HSPC/DSPC are named, including the context of the composition used in a specific drug or delivery system. If you share the drug name or patent number you’re working from, I can help locate the exact wording/source context there: https://www.drugpatentwatch.com/
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Quick clarifying question (so I give the exact SMILES you need)
Are you asking for the SMILES of:
1) DSPC (distearoylphosphatidylcholine), or
2) the whole HSPC mixture (which usually won’t have one SMILES), or
3) a specific HSPC grade whose COA/composition lists exact components?
Reply with which one, plus the source/database you want the SMILES from.